4.8 Article

Fluxonium: An Alternative Qubit Platform for High-Fidelity Operations

Related references

Note: Only part of the references are listed.
Article Physics, Multidisciplinary

Universal Fast-Flux Control of a Coherent, Low-Frequency Qubit

Helin Zhang et al.

Summary: The heavy-fluxonium circuit shows promise as a building block for superconducting quantum processors due to its long relaxation and dephasing time at the flux-frustration point. New protocols have been developed for reset, fast coherent control, and readout to enable high-quality operation of the qubit with 14 MHz transition frequency, significantly lower than the ambient thermal energy scale. By utilizing higher levels of the fluxonium and nonadiabatic Landau-Zener transitions, fast and high-fidelity single-qubit gates have been achieved with measurements of qubit coherence and average gate fidelity.

PHYSICAL REVIEW X (2021)

Article Physics, Multidisciplinary

Strong Quantum Computational Advantage Using a Superconducting Quantum Processor

Yulin Wu et al.

Summary: In this study, a two-dimensional programmable superconducting quantum processor named "Zuchongzhi" with 66 functional qubits was developed and used for random quantum circuits sampling to demonstrate quantum computational advantage. The high-precision and programmable quantum computing platform showed exponential outpacing of classical hardware and algorithmic improvements.

PHYSICAL REVIEW LETTERS (2021)

Review Physics, Multidisciplinary

Circuit quantum electrodynamics

Alexandre Blais et al.

Summary: Circuit quantum electrodynamics (QED) is an independent and thriving field of research that allows unprecedented detailed study and control of light-matter interaction at the quantum level. It has become essential in current approaches to gate-based digital quantum information processing with superconducting circuits, and also provides a framework for the study of hybrid quantum systems. The coherent coupling of superconducting qubits to microwave photons, dispersive qubit readout, and different regimes of light-matter interaction are key aspects of circuit QED.

REVIEWS OF MODERN PHYSICS (2021)

Review Multidisciplinary Sciences

Materials challenges and opportunities for quantum computing hardware

Nathalie P. de Leon et al.

Summary: Advances in quantum computing hardware technologies over the past two decades have been aimed at solving problems that classical computers cannot handle. Key materials challenges have been identified as limiting progress in quantum computing hardware platforms, requiring interdisciplinary collaboration beyond current boundaries.

SCIENCE (2021)

Article Multidisciplinary Sciences

Removing leakage-induced correlated errors in superconducting quantum error correction

M. McEwen et al.

Summary: A new reset protocol has been used in this study to reduce errors caused by leakage in quantum bit computation, improving the performance of the quantum error correcting code and taking a key step towards scalable quantum computing.

NATURE COMMUNICATIONS (2021)

Article Multidisciplinary Sciences

New material platform for superconducting transmon qubits with coherence times exceeding 0.3 milliseconds

Alexander P. M. Place et al.

Summary: Superconducting transmon qubits are a leading platform for quantum computing and science, but improving qubit lifetimes and coherence times remains a challenge. Efforts to minimize contributions from surfaces have not led to significant improvements, but replacing niobium with tantalum in two-dimensional transmon qubits has shown promise in increasing lifetimes and coherence times.

NATURE COMMUNICATIONS (2021)

Article Physics, Multidisciplinary

Fast Logic with Slow Qubits: Microwave-Activated Controlled-Z Gate on Low-Frequency Fluxoniums

Quentin Ficheux et al.

Summary: The study demonstrates a controlled-Z gate between capacitively coupled fluxonium qubits, highlighting limitations and advantages for potential improvements in next-generation devices. Despite being slower than transmons, the gate is faster and the error rate comparable to the lowest reported for microwave-activated gates on transmons.

PHYSICAL REVIEW X (2021)

Article Multidisciplinary Sciences

Exponential suppression of bit or phase errors with cyclic error correction

Zijun Chen et al.

Summary: This study achieved exponential suppression of bit-flip or phase-flip errors in a two-dimensional grid of superconducting qubits using one-dimensional repetition codes, reducing logical error per round by more than 100-fold. Additionally, a method for analyzing error correlations with high precision was introduced, aiding in quantum error correction efforts.

NATURE (2021)

Article Physics, Multidisciplinary

Tunable Coupling Architecture for Fixed-Frequency Transmon Superconducting Qubits

J. Stehlik et al.

Summary: The article introduces a modified tunable bus architecture suitable for fixed-frequency qubits, achieving high-fidelity 2-qubit operations. Experimental results demonstrate a maximum gate fidelity of 99.85% with good calibration stability over one day.

PHYSICAL REVIEW LETTERS (2021)

Article Physics, Multidisciplinary

High-Fidelity Controlled-Z Gate with Maximal Intermediate Leakage Operating at the Speed Limit in a Superconducting Quantum Processor

V Negirneac et al.

Summary: The article introduces the SNZ CZ gate, which achieves fast two-qubit gate operations by maximizing intermediate leakage. The key advantage of SNZ lies in its simplicity of tuning, attributed to the regular structures of leakage and conditional phase as a function of two control parameters that are useful for intermediate-scale applications.

PHYSICAL REVIEW LETTERS (2021)

Article Physics, Multidisciplinary

Realization of High-Fidelity CZ and ZZ-Free iSWAP Gates with a Tunable Coupler

Youngkyu Sung et al.

Summary: High-fidelity two-qubit gates are crucial for quantum computation and simulation, but current frameworks do not fully address three-body multilevel dynamics. A new systematic approach is presented to optimize control and achieve CZ and ZZ-free iSWAP gates with high fidelity. Experimental results show interaction fidelities close to T-1 limits.

PHYSICAL REVIEW X (2021)

Article Physics, Applied

Quantum Nondemolition Dispersive Readout of a Superconducting Artificial Atom Using Large Photon Numbers

Daria Gusenkova et al.

Summary: The paper discusses a new fluxonium artificial atom where the signal-to-noise ratio continuously improves with increasing photon numbers up to around 200. Without the use of a parametric amplifier, high fidelities of 99% and 93% for feedback-assisted ground and excited state preparations were achieved at a photon number of 74. However, at higher photon numbers, leakage outside the qubit computational space limits the fidelity of quantum state preparation.

PHYSICAL REVIEW APPLIED (2021)

Article Quantum Science & Technology

Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors

Jared B. Hertzberg et al.

Summary: This article presents a solution to the problem of frequency crowding in fixed-frequency qubit architectures, which can greatly improve the precision of setting qubit frequencies through systematic adjustments. Using statistical modeling, the probability of avoiding frequency collisions was calculated, highlighting the importance of post-fabrication tuning in finding workable lattices in quantum systems.

NPJ QUANTUM INFORMATION (2021)

Article Physics, Multidisciplinary

Topological and Subsystem Codes on Low-Degree Graphs with Flag Qubits

Christopher Chamberland et al.

PHYSICAL REVIEW X (2020)

Article Physics, Applied

Improving wafer-scale Josephson junction resistance variation in superconducting quantum coherent circuits

J. M. Kreikebaum et al.

SUPERCONDUCTOR SCIENCE & TECHNOLOGY (2020)

Article Quantum Science & Technology

Leakage detection for a transmon-based surface code

Boris Mihailov Varbanov et al.

NPJ QUANTUM INFORMATION (2020)

Article Physics, Multidisciplinary

High-Contrast ZZ Interaction Using Superconducting Qubits with Opposite-Sign Anharmonicity

Peng Zhao et al.

PHYSICAL REVIEW LETTERS (2020)

Article Quantum Science & Technology

Decoherence benchmarking of superconducting qubits

Jonathan J. Burnett et al.

NPJ QUANTUM INFORMATION (2019)

Article Multidisciplinary Sciences

Quantum supremacy using a programmable superconducting processor

Frank Arute et al.

NATURE (2019)

Article Physics, Multidisciplinary

High-Coherence Fluxonium Qubit

Long B. Nguyen et al.

PHYSICAL REVIEW X (2019)

Article Physics, Multidisciplinary

Fluctuations of Energy-Relaxation Times in Superconducting Qubits

P. V. Klimov et al.

PHYSICAL REVIEW LETTERS (2018)

Article Optics

Microwave-activated controlled-Z gate for fixed-frequency fluxonium qubits

Konstantin N. Nesterov et al.

PHYSICAL REVIEW A (2018)

Article Multidisciplinary Sciences

Hardware-efficient variational quantum eigensolver for small molecules and quantum magnets

Abhinav Kandala et al.

NATURE (2017)

Article Physics, Multidisciplinary

Fluxonium-Based Artificial Molecule with a Tunable Magnetic Moment

A. Kou et al.

PHYSICAL REVIEW X (2017)

Article Quantum Science & Technology

3D integrated superconducting qubits

D. Rosenberg et al.

NPJ QUANTUM INFORMATION (2017)

Article Optics

Efficient Z gates for quantum computing

David C. Mckay et al.

PHYSICAL REVIEW A (2017)

Article Physics, Multidisciplinary

Measuring and Suppressing Quantum State Leakage in a Superconducting Qubit

Zijun Chen et al.

PHYSICAL REVIEW LETTERS (2016)

Article Physics, Applied

Surface participation and dielectric loss in superconducting qubits

C. Wang et al.

APPLIED PHYSICS LETTERS (2015)

Article Physics, Applied

Qubit Metrology of Ultralow Phase Noise Using Randomized Benchmarking

P. J. J. O'Malley et al.

PHYSICAL REVIEW APPLIED (2015)

Article Multidisciplinary Sciences

Superconducting quantum circuits at the surface code threshold for fault tolerance

R. Barends et al.

NATURE (2014)

Article Computer Science, Interdisciplinary Applications

QuTiP 2: A Python framework for the dynamics of open quantum systems

J. R. Johansson et al.

COMPUTER PHYSICS COMMUNICATIONS (2013)

Article Optics

Process verification of two-qubit quantum gates by randomized benchmarking

A. D. Corcoles et al.

PHYSICAL REVIEW A (2013)

Article Physics, Multidisciplinary

Improving Quantum Gate Fidelities by Using a Qubit to Measure Microwave Pulse Distortions

Simon Gustavsson et al.

PHYSICAL REVIEW LETTERS (2013)

Article Physics, Multidisciplinary

Coherent Josephson Qubit Suitable for Scalable Quantum Integrated Circuits

R. Barends et al.

PHYSICAL REVIEW LETTERS (2013)

Article Computer Science, Interdisciplinary Applications

QuTiP: An open-source Python framework for the dynamics of open quantum systems

J. R. Johansson et al.

COMPUTER PHYSICS COMMUNICATIONS (2012)

Article Physics, Multidisciplinary

Efficient Measurement of Quantum Gate Error by Interleaved Randomized Benchmarking

Easwar Magesan et al.

PHYSICAL REVIEW LETTERS (2012)

Article Physics, Multidisciplinary

Scalable and Robust Randomized Benchmarking of Quantum Processes

Easwar Magesan et al.

PHYSICAL REVIEW LETTERS (2011)

Article Multidisciplinary Sciences

Demonstration of two-qubit algorithms with a superconducting quantum processor

L. DiCarlo et al.

NATURE (2009)

Article Physics, Multidisciplinary

Simple Pulses for Elimination of Leakage in Weakly Nonlinear Qubits

F. Motzoi et al.

PHYSICAL REVIEW LETTERS (2009)

Article Multidisciplinary Sciences

Fluxonium: Single Cooper-Pair Circuit Free of Charge Offsets

Vladimir E. Manucharyan et al.

SCIENCE (2009)

Article Optics

Randomized benchmarking of quantum gates

E. Knill et al.

PHYSICAL REVIEW A (2008)

Article Optics

Charge-insensitive qubit design derived from the Cooper pair box

Jens Koch et al.

PHYSICAL REVIEW A (2007)

Article Physics, Multidisciplinary

Fidelity of quantum operations

Line Hjortshoj Pedersen et al.

PHYSICS LETTERS A (2007)

Article Multidisciplinary Sciences

Quantum coherent tunable coupling of superconducting qubits

A. O. Niskanen et al.

SCIENCE (2007)

Article Physics, Multidisciplinary

Sign- and magnitude-tunable coupler for superconducting flux qubits

R. Harris et al.

PHYSICAL REVIEW LETTERS (2007)

Article Physics, Multidisciplinary

Decoherence of flux qubits due to 1/f flux noise

F. Yoshihara et al.

PHYSICAL REVIEW LETTERS (2006)

Article Materials Science, Multidisciplinary

Decoherence in a superconducting quantum bit circuit -: art. no. 134519

G Ithier et al.

PHYSICAL REVIEW B (2005)

Article Physics, Multidisciplinary

Approaching unit visibility for control of a superconducting qubit with dispersive readout

A Wallraff et al.

PHYSICAL REVIEW LETTERS (2005)

Article Physics, Multidisciplinary

A simple formula for the average gate fidelity of a quantum dynamical operation

MA Nielsen

PHYSICS LETTERS A (2002)