Jungsang Kim

Journal article Nature communications · April 2025 The spin-boson model, involving spins interacting with a bath of quantum harmonic oscillators, is a widely used representation of open quantum systems that describe many dissipative processes in physical, chemical and biological systems. Trapped ions prese ... Full text Cite

Design and characterization of individual addressing optics based on multi-channel acousto-optic modulator for 171Yb+ qubits

Journal article Optics and Laser Technology · January 1, 2025 We present the design and characterization of individual addressing optics based on a multi-channel acousto-optic modulator (AOM) for trapped ytterbium-171 ions. The design parameters of the individual addressing system were determined based on the tradeof ... Full text Cite

Orbital-optimized pair-correlated electron simulations on trapped-ion quantum computers

Journal article Npj Quantum Information · December 1, 2023 Variational quantum eigensolvers (VQE) are among the most promising approaches for solving electronic structure problems on near-term quantum computers. A critical challenge for VQE in practice is that one needs to strike a balance between the expressivity ... Full text Cite

Quantum simulation of conical intersections using trapped ions.

Journal article Nature chemistry · November 2023 Conical intersections often control the reaction products of photochemical processes and occur when two electronic potential energy surfaces intersect. Theory predicts that the conical intersection will result in a geometric phase for a wavepacket on the g ... Full text Cite

Quantum Simulation of Polarized Light-Induced Electron Transfer with a Trapped-Ion Qutrit System.

Journal article The journal of physical chemistry letters · July 2023 Electron transfer within and between molecules is crucial in chemistry, biochemistry, and energy science. This study describes a quantum simulation method that explores the influence of light polarization on electron transfer between two molecules. By impl ... Full text Cite

Angle-robust two-qubit gates in a linear ion crystal

Journal article Physical Review A · March 1, 2023 In trapped-ion quantum computers, two-qubit entangling gates are generated by applying spin-dependent force which uses phonons to mediate interaction between the internal states of the ions. To maintain high-fidelity two-qubit gates under fluctuating exper ... Full text Cite

Designing Filter Functions of Frequency-Modulated Pulses for High-Fidelity Two-Qubit Gates in Ion Chains

Journal article Physical Review Applied · January 1, 2023 High-fidelity two-qubit gates in quantum computers are often hampered by fluctuating experimental parameters. The effects of time-varying parameter fluctuations lead to coherent noise on the qubits, which can be suppressed by designing control signals with ... Full text Cite

Crosstalk Suppression in Individually Addressed Two-Qubit Gates in a Trapped-Ion Quantum Computer.

Journal article Physical review letters · December 2022 Crosstalk between target and neighboring spectator qubits due to spillover of control signals represents a major error source limiting the fidelity of two-qubit entangling gates in quantum computers. We show that in our laser-driven trapped-ion system cohe ... Full text Cite

Generative quantum learning of joint probability distribution functions

Journal article Physical Review Research · October 1, 2022 Modeling joint probability distributions is an important task in a wide variety of fields. One popular technique for this employs a family of multivariate distributions with uniform marginals called copulas. While the theory of modeling joint distributions ... Full text Cite

Determination of Multimode Motional Quantum States in a Trapped Ion System.

Journal article Physical review letters · September 2022 Trapped atomic ions are a versatile platform for studying interactions between spins and bosons by coupling the internal states of the ions to their motion. Measurement of complex motional states with multiple modes is challenging, because all motional sta ... Full text Cite

Hidden Inverses: Coherent Error Cancellation at the Circuit Level

Journal article Physical Review Applied · March 1, 2022 Coherent gate errors are a concern in many proposed quantum-computing architectures. Here, we show that certain coherent errors can be reduced by a local optimization that chooses between two forms of the same Hermitian and unitary quantum gate. We refer t ... Full text Cite

High-Stability Cryogenic System for Quantum Computing with Compact Packaged Ion Traps

Journal article IEEE Transactions on Quantum Engineering · January 1, 2022 Cryogenic environments benefit ion trapping experiments by offering lower motional heating rates, collision energies, and an ultrahigh vacuum (UHV) environment for maintaining long ion chains for extended periods of time. Mechanical vibrations caused by co ... Full text Cite

Stable Turnkey Laser System for a Yb/Ba Trapped-Ion Quantum Computer

Journal article IEEE Transactions on Quantum Engineering · January 1, 2022 This work presents a stable and reliable turnkey continuous-wave laser system for a Yb/Ba multispecies trapped-ion quantum computer. The compact and rack-mountable optics system exhibits high robustness, operating over a year without realignment, regardles ... Full text Cite

Nearest centroid classification on a trapped ion quantum computer

Journal article Npj Quantum Information · December 1, 2021 Quantum machine learning has seen considerable theoretical and practical developments in recent years and has become a promising area for finding real world applications of quantum computers. In pursuit of this goal, here we combine state-of-the-art algori ... Full text Cite

Optimizing electronic structure simulations on a trapped-ion quantum computer using problem decomposition

Journal article Communications Physics · December 1, 2021 Quantum computers have the potential to advance material design and drug discovery by performing costly electronic structure calculations. A critical aspect of this application requires optimizing the limited resources of the quantum hardware. Here, we exp ... Full text Cite

Batch Optimization of Frequency-Modulated Pulses for Robust Two-Qubit Gates in Ion Chains

Journal article Physical Review Applied · August 1, 2021 Two-qubit gates in trapped-ion quantum computers are generated by applying spin-dependent forces that temporarily entangle the internal state of the ion with its motion. Laser pulses are carefully designed to generate a maximally entangling gate between th ... Full text Cite

Development of Quantum Interconnects (QuICs) for Next-Generation Information Technologies

Journal article Prx Quantum · January 1, 2021 Just as "classical"information technology rests on a foundation built of interconnected information-processing systems, quantum information technology (QIT) must do the same. A critical component of such systems is the "interconnect,"a device or process th ... Full text Cite

Quantum Computer Systems for Scientific Discovery

Journal article Prx Quantum · January 1, 2021 The great promise of quantum computers comes with the dual challenges of building them and finding their useful applications. We argue that these two challenges should be considered together, by codesigning full-stack quantum computer systems along with th ... Full text Cite

Vacuum characterization of a compact room-temperature trapped ion system

Journal article Applied Physics Letters · December 7, 2020 We present the design and vacuum performance of a compact room-temperature trapped ion system for quantum computing, consisting of an ultra-high vacuum (UHV) package, a micro-fabricated surface trap, and a small form-factor ion pump. The system is designed ... Full text Cite

Ground-state energy estimation of the water molecule on a trapped-ion quantum computer

Journal article Npj Quantum Information · December 1, 2020 Quantum computing leverages the quantum resources of superposition and entanglement to efficiently solve computational problems considered intractable for classical computers. Examples include calculating molecular and nuclear structure, simulating strongl ... Full text Cite

Submillisecond, nondestructive, time-resolved quantum-state readout of a single, trapped neutral atom

Journal article Physical Review A · November 2, 2020 We achieve fast, nondestructive quantum-state readout via fluorescence detection of a single Rb87 atom in the 5S1/2 (F=2) ground state held in an optical dipole trap. The atom is driven by linearly polarized readout laser beams, making the scheme insensiti ... Full text Cite

High-Fidelity Two-Qubit Gates Using a Microelectromechanical-System-Based Beam Steering System for Individual Qubit Addressing.

Journal article Physical review letters · October 2020 In a large scale trapped atomic ion quantum computer, high-fidelity two-qubit gates need to be extended over all qubits with individual control. We realize and characterize high-fidelity two-qubit gates in a system with up to four ions using radial modes. ... Full text Cite

Multimode Time-Delay Interferometer for Free-Space Quantum Communication

Journal article Physical Review Applied · February 1, 2020 Quantum communication schemes such as quantum key distribution (QKD) and superdense teleportation provide unique opportunities to communicate information securely. Increasingly, optical communication is being extended to free-space channels, but atmospheri ... Full text Cite

High-speed low-crosstalk detection of a 171Yb+ qubit using superconducting nanowire single photon detectors

Journal article Communications Physics · December 1, 2019 Qubits used in quantum computing suffer from errors, either from the qubit interacting with the environment, or from imperfect quantum logic gates. Effective quantum error correcting codes require a high fidelity readout of ancilla qubits from which the er ... Full text Cite

Efficient isotope-selective pulsed laser ablation loading of ¹⁷⁴Yb⁺ ions in a surface electrode trap.

Journal article Optics express · November 2019 We report a highly efficient loading of 174Yb+ ions in a surface electrode ion trap by using single pulses from a Q-switched Nd:YAG laser to ablate neutral atoms, combined with a two-photon photo-ionization process. The method is thre ... Full text Cite

Benchmarking an 11-qubit quantum computer.

Journal article Nature communications · November 2019 The field of quantum computing has grown from concept to demonstration devices over the past 20 years. Universal quantum computing offers efficiency in approaching problems of scientific and commercial interest, such as factoring large numbers, searching d ... Full text Cite

Universal Model for the Turn-On Dynamics of Superconducting Nanowire Single-Photon Detectors

Journal article Physical Review Applied · September 11, 2019 We describe an electrothermal model for the turn-on dynamics of superconducting nanowire single-photon detectors (SNSPDs). By extracting a scaling law from a well-known electrothermal model of SNSPDs, we show that the rise time of the readout signal encode ... Full text Cite

Scalable high-rate, high-dimensional time-bin encoding quantum key distribution

Journal article Quantum Science and Technology · June 11, 2019 We propose and experimentally demonstrate a new scheme for measuring high-dimensional phase states using a two-photon interference technique, which we refer to as quantum-controlled measurement. Using this scheme, we implement a d-dimensional time-phase qu ... Full text Cite

An Outlook for Quantum Computing [Point of View]

Journal article Proceedings of the IEEE · January 1, 2019 We have ubiquitous presence of computers today, ranging from simple controllers in modern appliances to smartphones in our pockets that provide a wide range of everyday services, to powerful supercomputers and large data centers that carry out the most com ... Full text Cite

Bounding the outcome of a two-photon interference measurement using weak coherent states.

Journal article Optics letters · August 2018 The interference of two photons at a beam splitter is at the core of many quantum photonic technologies, such as quantum key distribution or linear-optics quantum computing. Observing high-visibility interference is challenging because of the difficulty of ... Full text Open Access Cite

Scalable cryogenic readout circuit for a superconducting nanowire single-photon detector system.

Journal article The Review of scientific instruments · June 2018 The superconducting nanowire single-photon detector (SNSPD) is a leading technology for quantum information science applications using photons, and is finding increasing uses in photon-starved classical imaging applications. Critical detector characteristi ... Full text Cite

Securing quantum key distribution systems using fewer states

Journal article Physical Review A · April 30, 2018 Quantum key distribution (QKD) allows two remote users to establish a secret key in the presence of an eavesdropper. The users share quantum states prepared in two mutually unbiased bases: one to generate the key while the other monitors the presence of th ... Full text Cite

A quantum computing performance simulator based on circuit failure probability and fault path counting

Journal article ACM Journal on Emerging Technologies in Computing Systems · March 1, 2018 Quantum computing performance simulators are needed to provide practical metrics for the effectiveness of executing theoretical quantum information processing protocols on physical hardware. In this work, we present a tool to simulate the execution of faul ... Full text Cite

Multi-photon detection using a conventional superconducting nanowire single-photon detector

Journal article Optica · December 20, 2017 We present the first evidence of multi-photon detection using a conventional superconducting nanowire single-photon detector, indicating number resolution up to four photons. The observed multi-photon detection statistics are consistent with the prediction ... Full text Cite

Provably secure and high-rate quantum key distribution with time-bin qudits.

Journal article Science advances · November 2017 The security of conventional cryptography systems is threatened in the forthcoming era of quantum computers. Quantum key distribution (QKD) features fundamentally proven security and offers a promising option for quantum-proof cryptography solution. Althou ... Full text Cite

Design and characterization of an integrated surface ion trap and micromirror optical cavity.

Journal article Applied optics · August 2017 We have fabricated and characterized laser-ablated micromirrors on fused silica substrates for constructing stable Fabry-Perot optical cavities. We highlight several design features which allow these cavities to have lengths in the 250-300 μm range and be ... Full text Cite

Robust and Stable Delay Interferometers with Application to d -Dimensional Time-Frequency Quantum Key Distribution

Journal article Physical Review Applied · April 18, 2017 We experimentally investigate a cascade of temperature-compensated unequal-path interferometers that can be used to measure frequency states in a high-dimensional quantum distribution system. In particular, we demonstrate that commercially available interf ... Full text Cite

Scalable digital hardware for a trapped ion quantum computer

Journal article Quantum Information Processing · December 1, 2016 Many of the challenges of scaling quantum computer hardware lie at the interface between the qubits and the classical control signals used to manipulate them. Modular ion trap quantum computer architectures address scalability by constructing individual qu ... Full text Cite

An integrated mirror and surface ion trap with a tunable trap location

Journal article Applied Physics Letters · November 28, 2016 We report a demonstration of a surface ion trap fabricated directly on a highly reflective mirror surface, which includes a secondary set of radio frequency (RF) electrodes allowing for translation of the quadrupole RF null location. We introduce a positio ... Full text Cite

Overcoming lossy channel bounds using a single quantum repeater node

Journal article Applied Physics B Lasers and Optics · April 1, 2016 We propose a scheme for performing quantum key distribution (QKD) which has the potential to beat schemes based on the direct transmission of photons between the communicating parties. In our proposal, the communicating parties exchange photons with two qu ... Full text Cite

Optimal architectures for long distance quantum communication.

Journal article Scientific reports · February 2016 Despite the tremendous progress of quantum cryptography, efficient quantum communication over long distances (≥ 1000 km) remains an outstanding challenge due to fiber attenuation and operation errors accumulated over the entire communication distance. Quan ... Full text Cite

Role of syndrome information on a one-way quantum repeater using teleportation-based error correction

Journal article Physical Review A · January 1, 2016 We investigate a quantum repeater scheme for quantum key distribution based on the work by S. Muralidharan [Phys. Rev. Lett. 112, 250501 (2014)]PRLTAO0031-900710.1103/PhysRevLett.112.250501. Our scheme extends that work by making use of error syndrome meas ... Full text Cite

Co-designing a scalable quantum computer with trapped atomic ions

Journal article Npj Quantum Information · January 1, 2016 The first generation of quantum computers are on the horizon, fabricated from quantum hardware platforms that may soon be able to tackle certain tasks that cannot be performed or modelled with conventional computers. These quantum devices will not likely b ... Full text Cite

Error compensation of single-qubit gates in a surface-electrode ion trap using composite pulses

Journal article · December 16, 2015 © 2015 American Physical Society.The fidelity of laser-driven quantum logic operations on trapped ion qubits tend to be lower than microwave-driven logic operations due to the difficulty of stabilizing the driving fields at the ion location. Through stabil ... Full text Open Access Cite

Designing a million-qubit quantum computer using a resource performance simulator

Journal article ACM Journal on Emerging Technologies in Computing Systems · December 1, 2015 The optimal design of a fault-Tolerant quantum computer involves finding an appropriate balance between the burden of large-scale integration of noisy components and the load of improving the reliability of hardware technology. This balance can be evaluate ... Full text Open Access Cite

Integrated optical systems approach to ion trap quantum repeaters

Journal article Integrated Photonics Research Silicon and Nanophotonics Iprsn 2015 · January 1, 2015 A quantum communication node with high quality quantum memories and photonic interfaces capable of quantum logic operations provide a technology platform for realizing quantum repeaters. We will discuss a viable implementation in trapped ion systems. © 201 ... Full text Cite

Trapped Ions Make Impeccable Qubits

Journal article Physics · November 24, 2014 Full text Open Access Cite

Individual addressing of trapped 171Yb+ ion qubits using a microelectromechanical systems-based beam steering system

Journal article Applied Physics Letters · November 3, 2014 The ability to individually manipulate the increasing number of qubits is one of the many challenges towards scalable quantum information processing with trapped ions. Using micro-mirrors fabricated with micro-electromechanical systems technology, we focus ... Full text Cite

Ultrafast and fault-tolerant quantum communication across long distances.

Journal article Physical review letters · June 2014 Quantum repeaters (QRs) provide a way of enabling long distance quantum communication by establishing entangled qubits between remote locations. In this Letter, we investigate a new approach to QRs in which quantum information can be faithfully transmitted ... Full text Cite

Characterization of the AWARE 10 two-gigapixel wide-field-of-view visible imager.

Journal article Applied optics · May 2014 System requirements for many military electro-optic and IR camera systems reflect the need for both wide-field-of-view situational awareness as well as high-resolution imaging for target identification. In this work we present a new imaging system architec ... Full text Cite

Novel synthetic methodology for controlling the orientation of zinc oxide nanowires grown on silicon oxide substrates.

Journal article Nanoscale · April 2014 This study presents a simple method to reproducibly obtain well-aligned vertical ZnO nanowire arrays on silicon oxide (SiOx) substrates using seed crystals made from a mixture of ammonium hydroxide (NH4OH) and zinc acetate (Zn(O2CCH3)2) solution. In compar ... Full text Cite

Large-scale modular quantum-computer architecture with atomic memory and photonic interconnects

Journal article Physical Review A Atomic Molecular and Optical Physics · February 13, 2014 The practical construction of scalable quantum-computer hardware capable of executing nontrivial quantum algorithms will require the juxtaposition of different types of quantum systems. We analyze a modular ion trap quantum-computer architecture with a hie ... Full text Cite

Optical performance test and validation of microcameras in multiscale, gigapixel imagers.

Journal article Optics express · February 2014 Wide field-of-view gigapixel imaging systems capable of diffraction-limited resolution and video-rate acquisition have a broad range of applications, including sports event broadcasting, security surveillance, astronomical observation, and bioimaging. The ... Full text Cite

Scalable quantum information processing with trapped ions

Journal article Optics InfoBase Conference Papers · January 1, 2014 We present a scalable approach to quantum information processing utilizing trapped ions and photons. Ions trapped in microfabricated surface traps provide a practical platform for realizing quantum networks of distributed computing nodes and quantum repeat ... Cite

Measuring the photonic frequency qubit generated by an 171Yb+ ion in a surface trap

Journal article Conference on Lasers and Electro Optics Europe Technical Digest · January 1, 2014 We propose a novel qubit state measurement method for photonic frequency qubits using a Mach-Zehnder interferometer with unequal path lengths. A practical implementation for photons generated by 171Yb+ ions in a surface trap is descri ... Cite

Trapped ion implementation of memory-assisted extended quantum key distribution

Journal article Conference on Lasers and Electro Optics Europe Technical Digest · January 1, 2014 We discuss a practical scheme to implement memory-assisted measurementdevice- independent quantum key distribution protocol using trapped ion systems with the potential to extend the range of conventional QKD by a factor of 2. ... Cite

Individual addressing of trapped 171Yb+ ion qubits using a microelectromechanical systems-based beam steering system

Journal article Appl. Phys. Lett. · 2014 Cite

Ultrafast and fault-tolerant quantum communication over long distance

Journal article Frontiers in Optics, FiO 2014 · 2014 © OSA 2014.We investigate quantum repeaters using small encoding blocks to correct both operational and photon loss errors, which can send quantum information over long distances at a rate only limited by local gate speed. ... Cite

Measuring the photonic frequency qubit generated by an ¹⁷¹yb⁺ ion in a surface trap

Journal article Optics InfoBase Conference Papers · January 1, 2014 We propose a novel qubit state measurement method for photonic frequency qubits using a Mach-Zehnder interferometer with unequal path lengths. A practical implementation for photons generated by 171Yb+ ions in a surface trap is described. © 2014 Optical So ... Cite

Trapped ion implementation of memory-assisted extended quantum key distribution

Journal article Optics Infobase Conference Papers · January 1, 2014 We discuss a practical scheme to implement memory-assisted measurementdevice- independent quantum key distribution protocol using trapped ion systems with the potential to extend the range of conventional QKD by a factor of 2. © 2014 OSA. ... Cite

Long-lived ion qubits in a microfabricated trap for scalable quantum computation

Journal article Optics Infobase Conference Papers · December 1, 2013 We report state detection, single qubit coherent operations and Raman sideband cooling to near the motional ground state by trapping a single 171Yb+ ion in a surface trap designed and fabricated at Sandia National Laboratories. © 2013 ... Cite

High speed, high fidelity detection of an atomic hyperfine qubit.

Journal article Optics letters · November 2013 Fast and efficient detection of the qubit state in trapped ion systems is critical for implementing quantum error correction and performing fundamental tests such as a loophole-free Bell test. In this work we present a simple qubit state detection protocol ... Full text Cite

Design of a spherical focal surface using close-packed relay optics: erratum.

Journal article Optics express · November 2013 A coding error was found in calculating the optimal packing distribution of our geodesic array. The error was corrected and the new optimization results in slightly improved packing density. The overall approach and algorithm remain unchanged. ... Full text Cite

Single qubit manipulation in a microfabricated surface electrode ion trap

Journal article NEW JOURNAL OF PHYSICS · September 13, 2013 Full text Link to item Cite

Trapping and cooling of ¹⁷⁴Yb⁺ ions in a microfabricated surface trap

Journal article JOURNAL OF THE KOREAN PHYSICAL SOCIETY · August 2013 Full text Link to item Cite

A testbed for wide-field, high-resolution, gigapixel-class cameras.

Journal article Rev Sci Instrum · May 2013 The high resolution and wide field of view (FOV) of the AWARE (Advanced Wide FOV Architectures for Image Reconstruction and Exploitation) gigapixel class cameras present new challenges in calibration, mechanical testing, and optical performance evaluation. ... Full text Link to item Cite

Aberration-corrected quantum temporal imaging system

Journal article PHYSICAL REVIEW A · April 8, 2013 Full text Link to item Cite

Scaling the Ion Trap Quantum Processor

Journal article SCIENCE · March 8, 2013 Full text Link to item Cite

Optomechanical design of multiscale gigapixel digital camera.

Journal article Applied optics · March 2013 Recent developments in multiscale imaging systems have opened up the possibility for commercially viable wide-field gigapixel cameras. While multiscale design principles allow tremendous simplification of the optical design, they place increased emphasis o ... Full text Cite

Novel Semiconductor Single-Photon Detectors

Journal article Experimental Methods in the Physical Sciences · 2013 In this Chapter, we summarize the current status and future prospects of a number of novel semiconductor-based single-photon detectors, including visible-light photon counters (VLPCs), solid-state photo-multipliers (SSPMs), and quantum-dot-based detectors. ... Full text Cite

Low-noise frequency downconversion for long-distance distribution of entangled atomic qubits

Journal article 2013 IEEE Photonics Society Summer Topical Meeting Series, PSSTMS 2013 · 2013 Distribution of quantum resources such as entanglement over distances beyond a few fiber attenuation lengths requires realization of quantum repeaters that utilize entanglement swapping to extend the distance between the entangled qubit pairs [1]. A quantu ... Full text Cite

Performance simulator based on hardware resources constraints for ion trap quantum computer

Journal article 2013 IEEE 31st International Conference on Computer Design Iccd 2013 · January 1, 2013 Efforts to build quantum computers using ion-traps have demonstrated all elementary qubit operations necessary for scalable implementation. Modular architectures have been proposed to construct modest size quantum computers with up to 104 - 10 Full text Cite

Wide-field microscopy using microcamera arrays

Journal article Progress in Biomedical Optics and Imaging - Proceedings of SPIE · 2013 A microcamera is a relay lens paired with image sensors. Microcameras are grouped into arrays to relay overlapping views of a single large surface to the sensors to form a continuous synthetic image. The imaged surface may be curved or irregular as each ca ... Full text Cite

Efficient testing methodologies for microcameras in a gigapixel imaging system

Journal article Proceedings of SPIE - The International Society for Optical Engineering · 2013 Multiscale parallel imaging - based on a monocentric optical design - promises revolutionary advances in diverse imaging applications by enabling high resolution, real-time image capture over a wide field-of-view (FOV), including sport broadcast, wide-fiel ... Full text Cite

Oversampled triangulation of AWARE-10 monocentric ball lens using an auto-stigmatic microscope

Journal article Optics Express · 2013 In our development of multiscale, gigapixel camera architectures, there is a need for an accurate three-dimensional position alignment of large monocentric lenses relative to hemispherical dome structures. In this work we describe a method for estimating t ... Full text Cite

A common scalable microcamera design for 2, 10, and 40 gigapixel class multiscale cameras

Journal article Frontiers in Optics Fio 2012 · December 1, 2012 Gigapixel camera economics favors reutilization of design components including optics, optomechanics, and electronics. We show microcamera designs for multiscale architectures that only change optical surface profiles that span orders of magnitude of gigap ... Cite

An ion trap photonic interface for efficient remote entanglement

Journal article Optics Infobase Conference Papers · December 1, 2012 Efficient entanglement of remote quantum memories is a key resource for distributed quantum information processing. We present a surface ion trap designed for efficient coupling of a single ion to the mode of a cavity. © OSA 2012. ... Cite

Engineering a gigapixel monocentric multiscale camera

Journal article OPTICAL ENGINEERING · August 2012 Full text Link to item Cite

Layered Architecture for Quantum Computing

Journal article PHYSICAL REVIEW X · July 31, 2012 Full text Link to item Cite

A ultra-high-vacuum wafer-fusion-bonding system.

Journal article Rev Sci Instrum · May 2012 The design of heterojunction devices is typically limited by material integration constraints and the energy band alignment. Wafer bonding can be used to integrate material pairs that cannot be epitaxially grown together due to large lattice mismatch. Cont ... Full text Link to item Cite

Stable optical phase modulation with micromirrors.

Journal article Opt Express · January 30, 2012 We measure the motional fluctuations of a micromechanical mirror using a Michelson interferometer, and demonstrate its interferometric stability. The position stability of the micromirror is dominated by the thermal mechanical noise of the structure. With ... Full text Link to item Cite

Quantum simulation of spin models on an arbitrary lattice with trapped ions

Journal article New Journal of Physics · 2012 A collection of trapped atomic ions represents one of the most attractive platforms for the quantum simulation of interacting spin networks and quantum magnetism. Spin-dependent optical dipole forces applied to an ion crystal create long-range effective sp ... Full text Cite

An ion trap photonic interface for efficient remote entanglement

Journal article 2012 Conference on Lasers and Electro-Optics, CLEO 2012 · 2012 Efficient entanglement of remote quantum memories is a key resource for distributed quantum information processing. We present a surface ion trap designed for efficient coupling of a single ion to the mode of a cavity. © 2012 OSA. ... Cite

Erratum: Band discontinuity measurements of the wafer bonded InGaAs/Si heterojunction (Applied Physics Letters (2007) 90 (222111))

Journal article Applied Physics Letters · 2012 Full text Cite

Sulfur-doped zinc oxide (ZnO) Nanostars: Synthesis and simulation of growth mechanism

Journal article Nano Research · 2012 We present a bottom-up synthesis, spectroscopic characterization, and ab initio simulations of star-shaped hexagonal zinc oxide (ZnO) nanowires. The ZnO nanostructures were synthesized by a low-temperature hydrothermal growth method. The cross-section of t ... Full text Cite

UV laser beam switching system for Yb trapped ion quantum information processing

Journal article Proceedings of SPIE - The International Society for Optical Engineering · 2012 Qubits based on trapped ions are being investigated as a promising platform for scalable quantum information processing. One challenge associated with the scalability of such a multi-qubit trapped ion system is the need for an ultraviolet (UV) laser beam s ... Full text Cite

Optical testing of the AWARE wide field 2-gigapixel multiscale camera

Journal article Optics Infobase Conference Papers · December 1, 2011 Testing a 2-Gigapixel 8 arcsec IFOV, 120° FOV camera requires integration of precision mechanical automation, optical instrumentation, image diagnostics, electronics and networking hardware. We detail the ongoing AWARE Wide Field Camera efforts. © 2011 OSA ... Cite

A multiscale, wide field, gigapixel camera

Journal article Optics Infobase Conference Papers · December 1, 2011 Recent investigations into high pixel count imaging using multiscale optics have led to a novel optical design for a wide field, gigapixel camera. We review the mechanical design and optical performance of this imager. © 2011 OSA. ... Cite

Design of a spherical focal surface using close-packed relay optics.

Journal article Opt Express · August 15, 2011 This paper presents a design strategy for close-packing circular finite-conjugate optics to create a spherical focal surface. Efficient packing of circles on a sphere is commonly referred to as the Tammes problem and various methods for packing optimizatio ... Full text Link to item Cite

A multiscale, wide field, gigapixel camera

Journal article Optics InfoBase Conference Papers · 2011 Cite

A multiscale, wide field, gigapixel camera

Journal article Optics InfoBase Conference Papers · 2011 Recent investigations into high pixel count imaging using multiscale optics have led to a novel optical design for a wide field, gigapixel camera. We review the mechanical design and optical performance of this imager. © 2011 OSA. ... Cite

Selective phase-matched bragg scattering for single-photon frequency conversion in a nonlinear waveguide

Journal article 2011 IEEE Photonics Society Summer Topical Meeting Series · 2011 We describe a design for phase-matched Bragg scattering for single-photon conversion between two arbitrary frequencies. The bandwidth of the Bragg scattering process is calculated and immunity against competing processes is discussed. © 2011 IEEE. ... Full text Cite

Efficient collection of single photons emitted from a trapped ion into a single-mode fiber for scalable quantum-information processing

Journal article Physical Review A - Atomic, Molecular, and Optical Physics · 2011 Interference and coincidence detection of two photons emitted by two remote ions can lead to an entangled state, which is a critical resource for scalable quantum-information processing. Currently the success probabilities of experimental realizations of t ... Full text Cite

Modular universal scalable ion-trap quantum computer (MUSIQC)

Journal article AIP Conference Proceedings · 2011 We describe a scalable architecture for general-purpose quantum computation based on trapped ions and photonic interconnect network. The quantum computer is made up of several elementary logic units (ELUs) each containing a modest number of trapped ions re ... Full text Cite

Double-stage frequency down-conversion system for distribution of ion-photon entanglement over long distances

Journal article 2011 IEEE Photonics Society Summer Topical Meeting Series · 2011 Generating entangled states of quantum memories over a long distance is an essential component for scalable quantum communication and its application such as quantum key distribution. Generation of entangled ion pairs mediated by photonic qubits has been d ... Full text Cite

Scaling quantum information processing using distributed remote entanglement

Journal article 2011 IEEE Photonics Society Summer Topical Meeting Series · 2011 Entanglement of remote quantum memories provides an alternative way to scale quantum information processing. We present progress toward improved remote entanglement generation, useful for distributed quantum computing. © 2011 IEEE. ... Full text Cite

Opportunities for single photon detection using visible light photon counters

Journal article Proceedings of SPIE - The International Society for Optical Engineering · 2011 Visible light photon counters (VLPCs) are solid-state devices providing high quantum efficiency (QE) photon detection (>88%) with photon number resolving capability and low timing jitter (∼250 ps). VLPC features high QE in the 0.4-1.0μm wavelength range ... Full text Cite

Multiscale optics for enhanced light collection from a point source.

Journal article Opt Lett · July 15, 2010 High-efficiency collection of photons emitted by a point source over a wide field of view (FoV) is crucial for many applications. Multiscale optics offer improved light collection by utilizing small optical components placed close to the optical source, wh ... Full text Open Access Link to item Cite

Independent individual addressing of multiple neutral atom qubits with a micromirror-based beam steering system

Journal article Applied Physics Letters · 2010 We demonstrate a scalable approach to addressing multiple atomic qubits for use in quantum information processing. Individually trapped 87Rb atoms in a linear array are selectively manipulated with a single laser guided by a microelectromechanical beam ste ... Full text Open Access Cite

Integrated sensing and information processing theme-based redesign of the undergraduate electrical and computer engineering curriculum at Duke University

Journal article Advances in Engineering Education · 2010 The field of electrical and computer engineering has evolved significantly in the past two decades. This evolution has broadened the field of ECE, and subfields have seen deep penetration into very specialized areas. Remarkable devices and systems arising ... Cite

Surface-electrode point Paul trap

Journal article Physical Review A - Atomic, Molecular, and Optical Physics · 2010 We present a model as well as experimental results for a surface electrode radiofrequency Paul trap that has a circular electrode geometry well suited for trapping single ions and two-dimensional planar ion crystals. The trap design is compatible with micr ... Full text Open Access Cite

Investigation of optical power tolerance for MEMS mirrors

Journal article Journal of Microelectromechanical Systems · 2010 Optical power tolerance on micromirrors is a critical aspect of many high-power optical systems. Absorptive heating can negatively impact the performance of an optical system by altering the micromirror's curvature during operation. This can lead to shifts ... Full text Cite

Single-photon detection timing jitter in a visible light photon counter

Journal article IEEE Journal of Quantum Electronics · 2010 Visible light photon counters (VLPCs) offer many attractive features as photon detectors, such as high quantum efficiency and photon number resolution. We report measurements of the single-photon timing jitter in a VLPC, a critical performance factor in a ... Full text Cite

Enhanced quantum efficiency of the visible light photon counter in the ultraviolet wavelengths.

Journal article Opt Express · April 27, 2009 The visible light photon counter (VLPC) is a very high quantum efficiency (QE, 88% at 694 nm) single photon detector in the visible wavelengths. The QE in the ultraviolet (UV) wavelenghths is poor in these devices due to absorption in the degenerate front ... Full text Link to item Cite

Multiplexed broadband beam steering system utilizing high speed MEMS mirrors.

Journal article Opt Express · April 27, 2009 We present a beam steering system based on micro-electromechanical systems technology that features high speed steering of multiple laser beams over a broad wavelength range. By utilizing high speed micromirrors with a broadband metallic coating, our syste ... Full text Link to item Cite

Enhanced light collection from a point fluorescent source using multiscale optics

Journal article Optics InfoBase Conference Papers · January 1, 2009 We have demonstrated enhancement of point source light collection by a factor of 18 over a traditional f/2.55 imaging system (~17%) across a 15 mm object space by integrating a high numerical aperture micromirror. © 2009 Optical Society of America. ... Cite

Optically multiplexed imaging with superposition space tracking

Journal article Optics Express · 2009 We describe a novel method to track targets in a large field of view. This method simultaneously images multiple, encoded sub-fields of view onto a common focal plane. Sub-field encoding enables target tracking by creating a unique connection between targe ... Full text Cite

Integrated optical approach to trapped ion quantum computation

Journal article Quantum Information and Computation · 2009 Recent experimental progress in quantum information processing with trapped ions have demonstrated most of the fundamental elements required to realize a scalable quantum computer. The next set of challenges lie in realization of a large number of qubits a ... Cite

Integrated optical approach to trapped ion quantum computation

Organic photovoltaic cell in lateral-tandem configuration employing continuously-tuned microcavity sub-cells.

Journal article Opt Express · November 24, 2008 We propose a lateral-tandem organic photovoltaic system consisting of a dispersive-focusing element and continuously-tuned, series-connected sub-cells. The proposed system overcomes the efficiency limitation of organic photovoltaic devices by spectral re-d ... Full text Link to item Cite

Superimposed video disambiguation for increased field of view.

Journal article Opt Express · October 13, 2008 Many infrared optical systems in wide-ranging applications such as surveillance and security frequently require large fields of view (FOVs). Often this necessitates a focal plane array (FPA) with a large number of pixels, which, in general, is very expensi ... Full text Link to item Cite

Noise reduction by diffusional dissipation in a minimal quorum sensing motif.

Journal article PLoS Comput Biol · August 29, 2008 Cellular interactions are subject to random fluctuations (noise) in quantities of interacting molecules. Noise presents a major challenge for the robust function of natural and engineered cellular networks. Past studies have analyzed how noise is regulated ... Full text Link to item Cite

MEMS-based optical beam steering system for quantum information processing in two-dimensional atomic systems.

Journal article Opt Lett · February 1, 2008 To provide scalability to quantum information processors utilizing trapped atoms or ions as quantum bits (qubits), the capability to address multiple individual qubits in a large array is needed. Microelectromechanical systems (MEMS) technology can be used ... Full text Link to item Cite

Optical MEMS technology for scalable quantum information processor

Journal article Optics InfoBase Conference Papers · January 1, 2008 We describe microsystems approach to realizing a scalable quantum information processor in trapped ions and atoms. A flexible, MEMS-based beam steering system is demonstrated that enables random access of qubits in a 2D array. © 2008 Optical Society of Ame ... Cite

Fast disambiguation of superimposed images for increased field of view

Journal article Proceedings - International Conference on Image Processing, ICIP · 2008 Many infrared optical systems in wide-ranging applications such as surveillance and security frequently require large fields of view. Often this necessitates a focal plane array (FPA) with a large number of pixels, which, in general, is very expensive. In ... Full text Cite

Optically multiplexed imaging with superposition space tracking

Journal article Proceedings of SPIE - The International Society for Optical Engineering · 2008 We describe a novel method to track targets in a large field of view. This method simultaneously images multiple, encoded sub-fields of view onto a common focal plane. Sub-field encoding enables target tracking by creating a unique connection between targe ... Full text Cite

Surface plasmon polariton assisted organic solar cells

Journal article Technical Proceedings of the 2008 NSTI Nanotechnology Conference and Trade Show, NSTI-Nanotech, Nanotechnology 2008 · 2008 We propose a lateral tandem cell system consisting of organic thin-film photovoltaic devices. The crucial element of the system is a surface plasmon polariton (SPP) assisted organic solar cell employing a metallic grating electrode. In the SPP-assisted sol ... Cite

Compact high quantum efficiency single photon detector in the ultraviolet wavelengths

Journal article Optics Infobase Conference Papers · January 1, 2007 We demonstrate a high quantum efficiency single photon detector with operating wavelength extended into the ultraviolet range (250nm-1μm). Quantum efficiency of 6% is demonstrated at 300 nm, with estimated internal efficiency of 24%. © 2007 Optical Society ... Cite

Compact high quantum efficiency single photon detector in the ultraviolet wavelengths

Journal article Optics InfoBase Conference Papers · January 1, 2007 We demonstrate a high quantum efficiency single photon detector with operating wavelength extended into the ultraviolet range (250nm-1μm). Quantum efficiency of 6% is demonstrated at 300 nm, with estimated internal efficiency of 24%. © 2007 Optical Society ... Cite

Integrated optics technology for quantum information processing in atomic systems

Journal article Optics Infobase Conference Papers · January 1, 2007 Scalable quantum information processing in ion traps or neutral atoms requires highly integrated and functional optical systems for qubit manipulation and detection. We discuss and demonstrate integrated optics technologies that are relevant for this appli ... Cite

Integrated optics technology for quantum information processing in atomic systems

Journal article Optics InfoBase Conference Papers · 2007 Scalable quantum information processing in ion traps or neutral atoms requires highly integrated and functional optical systems for qubit manipulation and detection. We discuss and demonstrate integrated optics technologies that are relevant for this appli ... Cite

Integrated optics technology for quantum information processing in atomic systems

Fundamentals of ECE: A rigorous, integrated introduction to electrical and computer engineering

Journal article IEEE Transactions on Education · 2007 The Electrical and Computer Engineering (ECE) Department at Duke University, Durham, NC, is undergoing extensive curriculum revisions that incorporate novel content, organization, and teaching methods. The cornerstone of the new curriculum is a theme-based ... Full text Cite

Design and characterization of MEMS micromirrors for ion-trap quantum computation

Journal article IEEE Journal on Selected Topics in Quantum Electronics · 2007 To build a large-scale quantum information processor (QIP) based on trapped ions or neutral atoms, integrated optical systems capable of delivering laser beams to multiple target locations are necessary. We consider a beam-shifting element consisting of a ... Full text Cite

Band discontinuity measurements of the wafer bonded InGaAsSi heterojunction

Journal article Applied Physics Letters · 2007 p -type InGaAsSi heterojunctions were fabricated through a wafer fusion bonding process. The relative band alignment between the two materials at the heterointerface was determined using current-voltage (I-V) measurements and applying thermionic emission-d ... Full text Cite

Dynamic aperture optical arrays based on polymeric MEMS actuators for large scale coding elements with application in visible to MWIR

Journal article Proceedings of SPIE - The International Society for Optical Engineering · 2007 Extension of coded apertures to the MWIR introduces the effects of diffraction and other distortions not observed in shorter wavelength systems. A new approach is being developed under the DARPA/SPO funded LACOSTE (Large Area Coverage Optical search-while ... Full text Cite

Integrated optics technology for quantum information processing in atomic systems

Journal article Conference on Lasers and Electro-Optics, 2007, CLEO 2007 · 2007 Scalable quantum information processing in ion traps or neutral atoms requires highly integrated and functional optical systems for qubit manipulation and detection. We discuss and demonstrate integrated optics technologies that are relevant for this appli ... Full text Cite

Integrated optics technology for quantum information processing in atomic systems

Journal article Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series · 2007 Scalable quantum information processing in ion traps or neutral atoms requires highly integrated and functional optical systems for qubit manipulation and detection. We discuss and demonstrate integrated optics technologies that are relevant for this appli ... Full text Cite

Electric-field-coupled metamaterials for microwave beam formation

Journal article IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) · 2007 Microwave propagation through an eleetrie-field-coupled metamaterial lens with a refractive index gradient is experimentally investigated. A gradient in the refractive index of the metamaterial is introduced by continuous tuning of a single parameter in th ... Full text Cite

Integrated optics technology for ion trap based large-scale quantum information processor

Journal article Optics InfoBase Conference Papers · January 1, 2006 Realizing ion trap based large-scale quantum information processor requires integrated optics technologies. We design and characterize basic optical beam steering system using micromirrors as a first step towards constructing high-quality functional integr ... Cite

Design and characterization of MEMS micromirrors for ion trap quantum computation

Journal article IEEE/LEOS International Conference on Optical MEMS and Their Applications Conference, 2006 · 2006 Cite

System design for large-scale ion trap quantum information processor

Journal article Quantum Information and Computation · 2005 We present a detailed system design and available technology choices for building a large scale (> 100 qubits) ion trap quantum information processor (QIP). The system design is based on technologies that are within reach today, and utilizes single-inst ... Cite

Performance of an Optical Switch Based on 3-D MEMS Crossconnect

Journal article IEEE Photonics Technology Letters · 2004 We demonstrate a fully functional microelectrome-chanical system-based optical crossconnect switch with advanced close-loop feedback control architecture for the mirrors. The system architecture was designed for handling multiple connections in parallel. T ... Full text Cite

Micromechanical Optical Crossconnect with 4-F Relay Imaging Optics

Journal article IEEE Photonics Technology Letters · 2004 We describe a novel optical configuration for a microelectromechanical system (MEMS)-based beam-steering optical crossconnect. It incorporates 4-F imaging optics to relay light to the MEMS chip. This makes the system more tolerant to fiber-microlens misali ... Full text Cite

256 × 256 port optical cross-connect subsystem

Journal article Journal of Lightwave Technology · 2004 This paper describes the subsystem design and performance of a 256 × 256-port micromechanical beam-steering optical cross-connect with 1.33-dB average loss, which can provide 238 × 238-port cross-connect with a maximum loss of less than 2 dB. This paper de ... Full text Cite

Training 1100 × 1100-port MEMS-based optical crossconnect switches

Journal article OSA Trends in Optics and Photonics Series · 2004 We report 1100 × 1100-port optical crossconnect switch using micro-electromechanical systems (MEMS) technology. The challenge of generating the database for each connection was addressed by advanced mathematical modeling, streamlined learning process and e ... Cite

Compact 64 × 64 micromechanical optical cross connect

Journal article IEEE Photonics Technology Letters · 2003 This letter describes a 64 × 64 beam steering optical cross connect constructed using surface micromachined mirrors. It used a curved mirror as a Fourier transform element and to fold the optical system. Both micromechanical switches mirror arrays are fabr ... Full text Cite

Control of microelectromechanical systems membrane curvature by silicon ion implantation

Journal article Applied Physics Letters · 2003 A study was performed on control of microelectromechanical systems (MEMS) membrane curvature by silicon ion implantation. The Si+ ion implantations were applied at dose levels of 0.4-5×1016/cm 2 into the gold metallization layer to reduce the mirror curvat ... Full text Cite

238 × 238 micromechanical optical cross connect

Journal article IEEE Photonics Technology Letters · 2003 This letter describes a 238 × 238 beam-steering optical cross connect constructed using surface micromachined mirrors. Its innovative optical configuration resulted in superior optical performance, achieving a mean fiber-to-fiber insertion loss of 1.33 dB ... Full text Cite

1100 × 1100 port MEMS-based optical crossconnect with 4-dB maximum loss

Journal article IEEE Photonics Technology Letters · 2003 We present a microelectromechanical systems-based beam steering optical crossconnect switch core with port count exceeding 1100, featuring mean fiber-to-fiber insertion loss of 2.1 dB and maximum insertion loss of 4.0 dB across all possible connections. Th ... Full text Cite

Optical MEMS devices for telecom systems

Journal article Proceedings of SPIE - The International Society for Optical Engineering · 2003 As telecom networks increase in complexity there is a need for systems capable of managing numerous optical signals. Many of the channel-manipulation functions can be done more effectively in optical domain. MEMS devices are especially well suited for thes ... Full text Cite

Beam-steering micromirrors for large optical cross-connects

Journal article Journal of Lightwave Technology · 2003 This paper describes Si-micromachined two-axis beam-steering micromirrors and their performance in 256 × 256-and 1024 × 1024-port large optical cross-connects (OXCs). The high-reflectivity wavelength-independent mirrors are electrostatically actuated; capa ... Full text Cite

Drift-Free, 1000G Mechanical Shock Tolerant Single-Crystal Silicon Two-Axis MEMS Tilting Mirrors in a 1000×1000-Port Optical Crossconnect

Journal article Conference on Optical Fiber Communication, Technical Digest Series · 2003 We report drift-free two-axis tilting MEMS mirrors fabricated from single crystal silicon. These micromirrors survive 1000G mechanical shocks and exhibit angular stability better than 4 millidegrees under simulated office vibrations. Two hermetically seale ... Cite

On the road to reliable MEMS

Journal article Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS · 2003 Dielectric charging, mechanical creep and fatigue of materials, stresses in thin films, sensitivity to mechanical vibrations and shock is but a partial list of issues that may arise on the road to reliable MEMS. Major electrical and mechanical phenomenon t ... Cite

Performance of large scale MEMS-based optical crossconnect switches

Journal article Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS · 2002 A three-dimensional MEMS optical crossconnect (OXC) switch fabric is described. The fabric design has two critical performance characteristics, one is the insertion loss and loss variation across possible connections, and another is the stability of optica ... Cite

238×238 surface micromachined optical crossconnect with 2dB maximum loss

Journal article Conference on Optical Fiber Communication, Technical Digest Series · 2002 A microelectromechanical system (MEMS)-based 238 x 238 micromachined optical crossconnect switch was discussed. The switch utilizes surface micromachined two-axis tilt mirrors which exhibit a curvature-induced loss of < 0.3 dB. Two fiber arrays with att ... Cite

Multi-service optical node based on low-losers MEMS optical crossconnect switch

Journal article Conference on Optical Fiber Communication, Technical Digest Series · 2002 A multi-service node based on an optical microelectromechanical (MEMS) crossconnect switch with 1.33 dB mean loss was demonstrated. Low loss optical switches could be combined with other optical components to build highly adaptable multiservice devices. A ... Cite

Scalable wavelength-selective crossconnect switch based on MEMS and planar waveguides

Journal article European Conference on Optical Communication, ECOC · 2001 A 72×72 wavelength-selective crossconnect switch that was scalable to 1296×1296 with available planar waveguide and MEMS technology, was demonstrated. Silica-on-silicon wavelength multiplexers with integrated monitoring taps and a MEMS micromirror array we ... Cite

1296-port MEMS transparent optical crossconnect with 2.07Petabit/s switch capacity

Journal article Conference on Optical Fiber Communication, Technical Digest Series · 2001 A 1296-port MEMS transparent optical crossconnect with 5.1dB+/-1.1dB insertion loss at 1550nm is reported. Measured worst-case optical crosstalk in a fabric was ñ38dB and nominal switching rise/fall times were 5msec. A 2.07Petabit/s switch capacity was ver ... Cite

Quantum electron optics and its applications

Journal article Quantum Mesoscopic Phenomena and Mesoscopic Devices in Microelectronics · 2000 We present two recent experiments that use current fluctuation measurements to probe the second-order electron correlation function (fourth-order in wavefunction amplitude): an intensity interferometry experiment called the Hanbury Brown and Twiss (1956) e ... Cite

Integration and packaging of MEMS relays

Journal article Proceedings of SPIE - The International Society for Optical Engineering · 2000 Micromachined relays provide switching solutions that are advantageous over existing technology in many aspects of device performance. In order to fully benefit from the MEMS solution in switching, however, a general integration strategy to various integra ... Cite

Simultaneous Coulomb blockade for electrons and holes in p-n junctions: observation of Coulomb staircase and turnstile operation

Journal article Physica E: Low-Dimensional Systems and Nanostructures · 2000 The Coulomb blockade effect in a mesoscopic double-barrier p-i-n junction is reported. The electron and hole injection into the central QW of a p-n junction is achieved via resonant tunneling. We present a theoretical model that describes the device operat ... Full text Cite

Hanbury Brown and Twiss-type experiment with electrons

Journal article Science (USA) · 1999 Fermion anti-bunching was directly observed by measuring the cross-covariance of the current fluctuations of partitioned electrons. A quantum point contact was used to inject single-mode electrons into a mesoscopic electron beam splitter device. The beam s ... Full text Link to item Cite

Multiphoton detection using visible light photon counter

Journal article Applied Physics Letters · 1999 Visible light photon counters feature noise-free avalanche multiplication and narrow pulse height distribution for single photon detection events. Such a well-defined pulse height distribution for a single photon detection event, combined with the fact tha ... Cite

A single-photon turnstile device

Journal article Nature · 1999 Quantum-mechanical interference between indistinguishable quantum particles profoundly affects their arrival time and counting statistics. Photons from a thermal source tend to arrive together (bunching) and their counting distribution is broader than the ... Full text Cite

Development of a high-quantum-efficiency single-photon counting system

Journal article Applied Physics Letters · 1999 A high-quantum-efficiency single-photon counting system has been developed. In this system, single photons were detected by a visible light photon counter operated at 6.9 K. The visible light photon counter is a solid state device that makes use of avalanc ... Full text Cite

Single-photon turnstile device: Simultaneous Coulomb blockade for electrons and holes

Journal article Semiconductor Science and Technology · 1998 Utilizing simultaneous Coulomb blockade for electrons and holes in a p-n junction, we can realize a device where a single electron and a single hole are injected into the active region to produce a single photon with well-regulated time interval. The photo ... Cite

Single photonics: Turnstile device and solid-state photomultiplier

Journal article Technical Digest - European Quantum Electronics Conference · 1998 Two single-photonic devices are presented. A single-photon turnstile device is based on the simultaneous Coulomb-blockade effect for electrons and holes in a mesoscopic, double-barrier, pn-tunnel junction. By periodically modulating the bias voltage betwee ... Cite

Noise-free avalanche multiplication in Si solid state photomultipliers

Journal article Applied Physics Letters · 1997 Si solid state photomultipliers utilize impact ionization of shallow impurity donor levels to create an avalanche multiplication when triggered by a photoexcited hole. The distribution of pulse height from a single photon detection event shows narrow dispe ... Cite

Theory of noise in p-n junction light emitters

Journal article Physical Review B - Condensed Matter and Materials Physics · 1997 The intensity noise of light generated by semiconductor lasers and light-emitting diodes is treated by semiclassical Langevin equations. An independent equation for the junction voltage dynamics is considered, and the non-Markoffian nature of the pump curr ... Cite

Electron and photon noise suppression in mesoscopic systems - How to teach noisy photons to follow quiet electrons

Journal article Materials Science and Engineering B · 1997 Principles of squeezed state generation in semiconductor lasers and light emitting diodes (LEDs) are discussed. Shot noise suppression in electron transport in macroscopic conductors is ultimately due to Pauli exclusion principle for fermion particles, ele ... Cite

Theory of pump-noise suppression in p-n junction light emitters

Journal article Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series · 1996 Pump noise suppression in constant-current driven semiconductor laser or LED is known to be the key mechanism in generating sub-Poissonian light from these sources. The authors have developed a theoretical model that describes their pumping mechanism. Pump ... Cite

Macroscopic Coulomb-blockade effect in a constant-current-driven light-emitting diode

Journal article Physical Review B · 1995 The intensity squeezing bandwidth of a light-emitting diode was measured as functions of a driving current, junction capacitance, and operation temperature. It was found that the squeezing bandwidth was linearly proportional to the current and inversely pr ... Full text Cite

Influence of Coulomb blockade effects on the squeezing bandwidth of semiconductor lasers

Journal article Proceedings of the International Quantum Electronics Conference (IQEC'94) · 1994 The discovery of Coulomb blockade effects revised the noise models of several mesoscopic and macroscopic devices. To check the proper noise model for p-n junction, the bandwidth is measured over which the external field amplitude fluctuation of a semicondu ... Cite

Combined hierarchical placement algorithm for row-based layouts

Journal article Electronics Letters · January 1, 1993 A hierarchical placement algorithm which combines mincut partitioning and simulated annealing has been developed. The objective of mincut partitioning is to minimise the number of crossing nets, while the objective of placement by simulated annealing is us ... Full text Cite