Christopher R Monroe

Conference Quantum 2 0 Proceedings Optica Quantum 2 0 Conference and Exhibition · January 1, 2023 In this work we discuss the progress of commissioning the next-generation trapped-ion quantum computing system. Heating rates, coherence times, background gas collision rates, individual-addressing cross-talk and other factors contributing to the gate fide ... Full text Cite

Progress towards a three-node ion-trap quantum network

Conference Proceedings of SPIE the International Society for Optical Engineering · January 1, 2023 Trapped ions are one of the leading platforms for quantum computation and networking, with long coherence times and high fidelity qubit operation. We exploit these attributes to build a quantum network with the use of three trapped ion modules connected vi ... Full text Cite

Quantum computing with atoms

Conference 2021 IEEE Hot Chips 33 Symposium Hcs 2021 · August 22, 2021 Full text Cite

Entanglement as a resource for quantum networking

Conference Proceedings Rochester Conference on Coherence and Quantum Optics Cqo 2019 · August 4, 2019 We examine the viability of quantum repeaters based on two-species trapped ion modules for long-distance quantum key distribution. We discuss the dependence of the quantum key distribution rate on various experimental parameters, including coupling efficie ... Cite

Quantum computing and simulation with trapped atomic ions

Conference Optics Infobase Conference Papers · January 1, 2019 I will review some of the latest results in both gate-based quantum computing and analog quantum simulation, speculating on how this platform can realistically be scaled in the near future. ... Full text Cite

Quantum repeaters based on two species trapped ions

Conference Optics Infobase Conference Papers · January 1, 2019 We consider two species trapped ions as building blocks of large-scale quantum repeaters across trans-continental distances. Key generation rate dependence on experimental gate error rates, operation time and coupling efficiency to a fiber is discussed. ... Full text Cite

Entanglement as a resource for quantum networking

Conference Optics Infobase Conference Papers · January 1, 2019 We examine the viability of quantum repeaters based on two-species trapped ion modules for long-distance quantum key distribution. We discuss the dependence of the quantum key distribution rate on various experimental parameters, including coupling efficie ... Cite

Quantum Repeaters Based on Two-Species Trapped Ions

Conference IEEE Photonics Society Summer Topicals Meeting Series Sum 2018 · September 5, 2018 Trapped ions technology is the most promising candidate for construction of the large-scale quantum computers, quantum repeaters and quantum networks. Quantum networks require matter qubits with fast quantum gates and measurement, efficient coupling to pho ... Full text Cite

Trapped ion single-photon emitter for quantum networking

Conference Optics Infobase Conference Papers · January 1, 2018 We demonstrate a single-photon source for quantum networking based on a single trapped 138Ba+ ion subject to pulsed excitation, and measure a second-order autocorrelation of g(2)(0) = (8.1 ± 2.3) × 10-5 without a ... Full text Cite

Reconfigurable and programmable ion trap quantum computer

Conference 2017 IEEE International Conference on Rebooting Computing Icrc 2017 Proceedings · November 28, 2017 We present progress on the construction and operation of a room-temperature quantum computer built with trapped atomic ion qubits. Based on the technological underpinnings of atomic clocks that define time, atomic qubits are standards of quantum informatio ... Full text Cite

Comparing the architectures of the first programmable quantum computers

Conference Optics Infobase Conference Papers · January 1, 2017 Cite

Interacting many-body spin systems that fail to quantum thermalize

Conference Optics Infobase Conference Papers · January 1, 2017 This talk will describe the experimental observation of two mechanisms -- many-body localization (MBL) and prethermalization -- that prevent interacting quantum systems from attaining thermal equilibrium. ... Full text Cite

Entanglement of quantum memories by interfering distinguishable photons

Conference Optics Infobase Conference Papers · January 1, 2017 Time-resolved photon detection can be used to generate entanglement between nonidentical qubits that emit distinguishable photons, which may be necessary for future modular quantum systems. We experimentally realize this process using remotely trapped ytte ... Full text Cite

Quantum networks with atoms, phonons, and photons

Conference Optics Infobase Conference Papers · January 1, 2013 Trapped atomic ions are the most advanced experimental platform for many-body entanglement and quantum information processing. Recent results in local entanglement between trapped ions for uses in quantum simulation of nontrivial spin models will be discus ... Full text Cite

Quantum networks with atoms and photons

Conference Journal of Physics Conference Series · January 1, 2013 Trapped atomic ions are standards for quantum information processing, as all of the fundamental quantum operations have been demonstrated in small collections of atoms. Current work is concentrated on scaling ion traps to larger numbers of interacting qubi ... Full text Cite

Trapped ions for testing foundations of quantum theory

Conference Aip Conference Proceedings · December 1, 2012 Here we give details of an experiment using trapped ions and photons that demonstrates a Bell inequality violation with a Bell signal of S = 2.22±0.07. This type of experimental setup has the potential to close both the detection and locality loopholes and ... Full text Cite

A cavity QED-Ion trap system for a scalable quantum network

Conference Optics Infobase Conference Papers · December 1, 2011 We observe an enhancement of the spontaneous emission from a single trapped ytterbium ion into a cavity QED system. This technique helps to scale up an ion-photon quantum network. © 2010 Optical Society of America. ... Cite

Private random number generation through remote atom entanglement

Conference 2011 IEEE Photonics Society Summer Topical Meeting Series · September 26, 2011 Random number generation is vital for a wide range of applications, including numerical simulation, gambling, and cryptography. However, verifying the randomness of a bit stream generated by a device is exceedingly difficult. Even if a sequence of numbers ... Full text Cite

Ion-photon networks for scalable quantum computing

Conference Optics Infobase Conference Papers · January 1, 2011 Trapped ions entangled via photonic interactions are promising avenues for quan- tum information processing. Here, we report advances towards combining photonic gates be- tween distant ions with Coulombic gates between nearby ions to demonstrate scalable q ... Full text Cite

Mode-locked laser driven gates for trapped ion quantum information processing

Conference Proceedings of the 20th International Conference on Laser Spectroscopy Icols 2011 · January 1, 2011 Single- and multi-qubit operations for trapped ion hyperfine or Zeeman qubits are typically implemented by continuous-wave lasers driving stimulated Raman transitions. Here we report two distinct regimes for driving these transitions with mode-locked pulse ... Cite

A cavity QED-ion trap system for a scalable quantum network

Conference 2011 Conference on Lasers and Electro Optics Laser Science to Photonic Applications CLEO 2011 · January 1, 2011 We observe an enhancement of the spontaneous emission from a single trapped ytterbium ion into a cavity QED system. This technique helps to scale up an ion-photon quantum network. © 2011 OSA. ... Full text Cite

Quantum optical networks with trapped ions

Conference Lasers and Electro Optics Quantum Electronics and Laser Science Conference 2010 Laser Science to Photonic Applications CLEO QELS 2010 · October 11, 2010 Trapped atomic ion quantum memories can be locally entangled via the Coulomb interaction and remotely entangled based on probabilistic photonic interfaces. Both versions are presented, highlighting their features and drawbacks when applied to quantum compu ... Cite

Quantum entanglement and information

Conference Optics Infobase Conference Papers · January 1, 2010 Quantum systems can store entangled superpositions of information, offering the possibility of enhanced performance in many applications. This talk will outline hardware used to make large scale entangled states, using atoms and light. © 2010 Optical Socie ... Full text Cite

Quantum optical networks with trapped ions

Conference Optics Infobase Conference Papers · January 1, 2010 Trapped atomic ion quantum memories can be locally entangled via the Coulomb interaction and remotely entangled based on probabilistic photonic interfaces. Both versions are presented, highlighting their features and drawbacks when applied to quantum compu ... Full text Cite

Trapped ion qubit operations with ultrashort pulses

Conference Optics Infobase Conference Papers · December 1, 2009 We describe an experiment to achieve ultrafast qubit operations on trapped 171Yb+ ions. We plan to use a series of short optical pulses to perform bit rotations and multi-bit entangling gates independent of ion temperature. © 2009 Opt ... Cite

High fidelity quantum entanglement and spin-spin dynamics using multiple phonon modes of several trapped ions

Conference 2009 Conference on Lasers and Electro Optics and 2009 Conference on Quantum Electronics and Laser Science Conference CLEO QELS 2009 · November 16, 2009 We demonstrate quantum entanglement and global spin dynamics between a few trapped ions, using lasers that couple to all modes of transverse motion in a way that could be scaled to large numbers of spins. © 2009 Optical Society of America. ... Cite

Teleportation of quantum information between distant atomic qubits

Conference 2009 Conference on Lasers and Electro Optics and 2009 Conference on Quantum Electronics and Laser Science Conference CLEO QELS 2009 · November 16, 2009 We teleport quantum information between two distant ytterbium ions trapped in different vacuum chambers separated by one meter. Full state tomography shows that the heralded probabilistic process employed has a fidelity of 90%. © 2009 Optical Society of Am ... Cite

A heralded quantum gate between remote atoms

Conference 2009 Conference on Lasers and Electro Optics and 2009 Conference on Quantum Electronics and Laser Science Conference CLEO QELS 2009 · November 16, 2009 We implement a probabilistic entangling gate between two distant trapped ytterbium ions and measure an average gate fidelity of 90%. © 2009 Optical Society of America. ... Cite

Trapped ion qubit operations with ultrashort pulses

Conference 2009 Conference on Lasers and Electro Optics and 2009 Conference on Quantum Electronics and Laser Science Conference CLEO QELS 2009 · November 16, 2009 We describe an experiment to achieve ultrafast qubit operations on trapped 171Yb+ ions. We plan to use a series of short optical pulses to perform bit rotations and multi-bit entangling gates independent of ion temperature. © 2009 Opt ... Cite

A heralded quantum gate between remote atoms

Conference Optics Infobase Conference Papers · January 1, 2009 We implement a probabilistic entangling gate between two distant trapped ytterbium ions and measure an average gate fidelity of 90%. © 2009 Optical Society of America. ... Full text Cite

Trapped ion qubit operations with ultrashort pulses

Conference Optics Infobase Conference Papers · January 1, 2009 We describe an experiment to achieve ultrafast qubit operations on trapped 171Yb+ ions. We plan to use a series of short optical pulses to perform bit rotations and multi-bit entangling gates independent of ion temperature. © 2009 Opt ... Full text Cite

Measurement-based entanglement and quantum information processing with remote ions

Conference Optics Infobase Conference Papers · January 1, 2009 We implement a probabilistic entangling gate between two remote trapped ytterbium ions and measure an average gate fidelity of 89%. The entangled state of the ions violates a Bell inequality. © 2009 Optical Society of America. ... Full text Cite

High fidelity quantum entanglement and spin-spin dynamics using multiple phonon modes of several trapped ions

Conference Optics Infobase Conference Papers · January 1, 2009 We demonstrate quantum entanglement and global spin dynamics between a few trapped ions, using lasers that couple to all modes of transverse motion in a way that could be scaled to large numbers of spins. © 2009 Optical Society of America. ... Full text Cite

Teleportation of quantum information between distant atomic qubits

Conference Optics Infobase Conference Papers · January 1, 2009 We teleport quantum information between two distant ytterbium ions trapped in different vacuum chambers separated by one meter. Full state tomography shows that the heralded probabilistic process employed has a fidelity of 90%. © 2009 Optical Society of Am ... Full text Cite

Measurement-based entanglement and quantum information processing with remote ions

Trapped ion quantum networks

Conference Conference on Quantum Electronics and Laser Science QELS Technical Digest Series · September 15, 2008 We describe the use of a photonic coupling between remote trapped ions for applications in quantum communication and quantum computing. © 2008 Optical Society of America. ... Full text Cite

Quantum interference of electromagnetic fields from two remote trapped atomic ions

Conference Optics Infobase Conference Papers · January 1, 2007 We observe quantum Hong-Ou-Mandel interference between electromagnetic fields emitted from two remote trapped ytterbium ions. This result points the way toward scaling to large entangled networks of remote qubits. © 2007 Optical Society of America. ... Full text Cite

Magneto-optical trap of cadmium

Conference Optics Infobase Conference Papers · January 1, 2007 We achieve the first magneto-optical trap of Cadmium. When integrated with a nearby ion trap, this allows for the possibility of protecting quantum information from environment perturbations via charge neutralization of trapped ions. © 2007 Optical Society ... Full text Cite

Quantum networking with trapped atomic ions

Conference LEOS Summer Topical Meeting · December 1, 2006 Cite

Scalable quantum computation with photons and trapped ions

Conference Conference Proceedings Lasers and Electro Optics Society Annual Meeting LEOS · January 1, 2006 Ultrafast laser pulses can be used for fast quantum gates and entangling gates offering an alternative method to scale quantum computing systems. We implement fundamental components of these entangling gates. © 2006 IEEE. ... Full text Cite

Ion trap networking: Cold, fast, and small

Conference Laser Spectroscopy Proceedings of the 17th International Conference Icols 2005 · January 1, 2005 A large-scale ion trap quantum computer will require low-noise entanglement schemes and methods for networking ions between different regions. We report work on both fronts, with the entanglement of two trapped cadmium ions following a phase-insensitive Mo ... Cite

A microscale quadrupole mass spectrometer for ion species analysis

Conference 40th AIAA ASME SAE ASEE Joint Propulsion Conference and Exhibit · January 1, 2004 Investigators have identified a quadrupole structure that uses non-traditional geometry with rectangular cantilevered electrodes and that is amenable to semiconductor fabrication. Despite the revolutiotiary electrode geometry, the proposed microscale quadr ... Full text Cite

Observation of entanglement between a single trapped atom and a single photon

Conference OSA Trends in Optics and Photonics Series · January 1, 2004 We report the first observation of entanglement between a stationary quantum memory and a 'flying' quantum bit. Coincident quantum state measurements between a single trapped atomic ion and its emitted photon directly verify the entanglement. ... Cite

Clean and scalable quantum logic with trapped ions

Conference Conference on Quantum Electronics and Laser Science QELS Technical Digest Series · December 1, 2003 Experimental progress in constructing a quantum computer with a collection of trapped ions is discussed, with emphasis on how various technical hurdles may be circumvented. ©2003 Optical Society of America. ... Cite

Decoherence of motional superpositions of a trapped ion

Conference Chaos Solitons and Fractals · January 1, 2003 We summarize experiments on the decoherence of motional superposition states of single trapped ions which were carried out at NIST. The decoherence was characterized by the loss of contrast in interference experiments involving superpositions of two motion ... Full text Cite

Clean and scalable quantum logic with trapped ions

Conference Optics Infobase Conference Papers · January 1, 2003 Experimental progress in constructing a quantum computer with a collection of trapped ions is discussed, with emphasis on how various technical hurdles may be circumvented. ... Cite

Trapped ions, entanglement, and quantum computing

Conference Proceedings of SPIE the International Society for Optical Engineering · December 1, 1998 A miniature, elliptical ring rf (Paul) ion trap has been used in recent experiments toward realizing a quantum computer in a trapped ion system. With the combination of small spatial dimensions and high rf drive potentials, around 500 V amplitude, we have ... Full text Cite

Quantum harmonic oscillator state synthesis and analysis

Conference Proceedings of SPIE the International Society for Optical Engineering · December 1, 1997 We laser-cool single beryllium ions in a Paul trap to the ground (n equals 0) quantum harmonic oscillator state with greater than 90% probability. From this starting point, we can put the atom into various quantum states of motion by application of optical ... Full text Cite

Engineering and tomography of quantum states of motion of a trapped atom

Conference Conference on Quantum Electronics and Laser Science QELS Technical Digest Series · January 1, 1997 The motional quantum state is fully reconstructed with the use of two schemes that determine the density matrix in the number state basis and the Wigner function. The techniques allow well-controlled experiments on decoherence and related phenomena on the ... Cite

Rf-trap apparatus for optical frequency standards

Conference CPEM Digest Conference on Precision Electromagnetic Measurements · December 1, 1994 A novel rf (Paul) ion trap apparatus, capable of providing extremely tight confinement is described. Strong localization of trapped ions reduces an important source of noise when using the ions as an optical frequency standard. Alternative cooling schemes, ... Cite