Scholars@Duke
Crystal Noel

Crystal Noel

Assistant Professor of Electrical and Computer Engineering
Electrical and Computer Engineering
crystal.noel@duke.edu
701 W Main St, Chesterfield Building, Durham, NC 27701

Selected Publications

In situ midcircuit qubit measurement and reset in a single-species trapped-ion quantum computing system

Journal Article Physical Review Research · December 31, 2025 We implement midcircuit measurement and reset (MCMR) operations on a full-scale trapped-ion quantum computing system by using metastable qubit states in ... Full text Cite

Ion-chain sympathetic cooling and gate dynamics

Journal Article Physical Review Applied · October 1, 2024 Sympathetic cooling is a technique often employed to mitigate motional heating in trapped-ion quantum computers. However, choosing system parameters such as number of coolants and cooling duty cycle for optimal gate performance requires evaluating trade-of ... Full text Cite

Experimental implementation of an efficient test of quantumness

Journal Article Physical Review A · January 1, 2024 A test of quantumness is a protocol where a classical user issues challenges to a quantum device to determine if it exhibits nonclassical behavior, under certain cryptographic assumptions. Recent attempts to implement such tests on current quantum computer ... Full text Cite

Phase transition in magic with random quantum circuits.

Journal Article Nature physics · January 2024 Magic is a property of quantum states that enables universal fault-tolerant quantum computing using simple sets of gate operations. Understanding the mechanisms by which magic is created or destroyed is, therefore, a crucial step towards efficient and prac ... Full text Cite

Integrating Thin-Film Lithium Niobate Photonics and Surface-Electrode Ion Traps

Conference CLEO Science and Innovations CLEO S and I 2024 in Proceedings CLEO 2024 Part of Conference on Lasers and Electro Optics · January 1, 2024 Integrated photonics offers trapped-ion experiments scalable performance advantages and opportunities for monolithic optical control. We present plans for adding thin-film lithium niobate to the trapped-ion photonics toolkit, enabling on-chip modulator int ... Cite

Integrating Thin-Film Lithium Niobate Photonics and Surface-Electrode Ion Traps

Conference 2024 Conference on Lasers and Electro-Optics, CLEO 2024 · January 1, 2024 Integrated photonics offers trapped-ion experiments scalable performance advantages and opportunities for monolithic optical control. We present plans for adding thin-film lithium niobate to the trapped-ion photonics toolkit, enabling on-chip modulator int ... Cite

Integrating Thin-Film Lithium Niobate Photonics and Surface-Electrode Ion Traps

Conference 2024 Conference on Lasers and Electro Optics CLEO 2024 · January 1, 2024 Integrated photonics offers trapped-ion experiments scalable performance advantages and opportunities for monolithic optical control. We present plans for adding thin-film lithium niobate to the trapped-ion photonics toolkit, enabling on-chip modulator int ... Full text Cite

Interactive cryptographic proofs of quantumness using mid-circuit measurements

Journal Article Nature Physics · November 1, 2023 The ability to perform measurements in the middle of a quantum circuit is a powerful resource. It underlies a wide range of applications, from remote state preparation to quantum error correction. Here we apply mid-circuit measurements for a particular tas ... Full text Cite

Digital quantum simulation of NMR experiments.

Journal Article Science advances · November 2023 Simulations of nuclear magnetic resonance (NMR) experiments can be an important tool for extracting information about molecular structure and optimizing experimental protocols but are often intractable on classical computers for large molecules such as pro ... Full text Cite

Next-generation trapped-ion quantum computing system

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

Cross-platform comparison of arbitrary quantum states.

Journal Article Nature communications · November 2022 As we approach the era of quantum advantage, when quantum computers (QCs) can outperform any classical computer on particular tasks, there remains the difficult challenge of how to validate their performance. While algorithmic success can be easily verifie ... Full text Cite

Changes in electric field noise due to thermal transformation of a surface ion trap

Journal Article Physical Review B · July 15, 2022 We aim to illuminate how the microscopic properties of a metal surface map to its electric field noise characteristics. In our system, prolonged heat treatments of a metal film can induce a rise in the magnitude of the electric field noise generated by the ... Full text Cite

Measurement-induced quantum phases realized in a trapped-ion quantum computer

Journal Article Nature Physics · July 1, 2022 Many-body open quantum systems balance internal dynamics against decoherence and measurements induced by interactions with an environment1,2. Quantum circuits composed of random unitary gates with interspersed projective measurements represent a ... Full text Open Access Cite

Control of Transverse Motion for Quantum Gates on Individually Addressed Atomic Qubits

Journal Article Prx Quantum · March 1, 2022 Individual trapped atomic qubits represent one of the most promising technologies to scale quantum computers, owing to their low idle errors and the ability to implement a full set of reconfigurable gate operations via focused optical fields. However, the ... Full text Cite

Optimizing Stabilizer Parities for Improved Logical Qubit Memories.

Journal Article Physical review letters · December 2021 We study variants of Shor's code that are adept at handling single-axis correlated idling errors, which are commonly observed in many quantum systems. By using the repetition code structure of the Shor's code basis states, we calculate the logical channel ... Full text Cite

Fault-tolerant control of an error-corrected qubit.

Journal Article Nature · October 2021 Quantum error correction protects fragile quantum information by encoding it into a larger quantum system1,2. These extra degrees of freedom enable the detection and correction of errors, but also increase the control complexity of the encoded l ... Full text Open Access Cite

Electric-field noise from thermally activated fluctuators in a surface ion trap

Journal Article Physical Review A · June 26, 2019 We probe electric-field noise near the metal surface of an ion-trap chip in the temperature range from 295 to 530 K. We observe a nontrivial temperature dependence with the noise amplitude at 1 MHz frequency saturating around 500 K. Measurements of the noi ... Full text Cite

Realization of Translational Symmetry in Trapped Cold Ion Rings.

Journal Article Physical review letters · February 2017 We crystallize up to 15 ^{40}Ca^{+} ions in a ring with a microfabricated silicon surface Paul trap. Delocalization of the Doppler laser-cooled ions shows that the translational symmetry of the ion ring is preserved at millikelvin temperatures. By characte ... Full text Cite

Surface traps for freely rotating ion ring crystals

Journal Article Journal of Physics B Atomic Molecular and Optical Physics · September 16, 2015 Rings of trapped ions are an attractive system to study quantum-many body dynamics with closed boundary conditions as well as symmetry breaking. One of the biggest challenges towards such experiments is to sufficiently suppress rotational imperfections of ... Full text Cite

Experimental violation of three families of Bell's inequalities

Journal Article Physical Review A · March 8, 2013 Full text Cite