Fast parametric two-qubit gate for highly detuned fixed-frequency superconducting qubits using a double-transmon coupler

Article Engineering, Electrical & Electronic

Toward Realization of Scalable Packaging and Wiring for Large-Scale Superconducting Quantum Computers

Shuhei Tamate et al.

Summary: This paper reviews the basic components of superconducting quantum computers, with a focus on the packaging and wiring technologies required for large-scalable superconducting quantum computers.

IEICE TRANSACTIONS ON ELECTRONICS (2022)

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Article Physics, Applied

Fast Readout and Reset of a Superconducting Qubit Coupled to a Resonator with an Intrinsic Purcell Filter

Y. Sunada et al.

Summary: This study demonstrates the suppression of resonator-mediated qubit decay by utilizing the distributed-element, multimode nature of the resonator. Using this method, high-fidelity readout and reset operations can be achieved.

PHYSICAL REVIEW APPLIED (2022)

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Article Physics, Applied

Tunable coupling of widely separated superconducting qubits: A possible application toward a modular quantum device

Peng Zhao et al.

Summary: This research proposes a conceptual design of a modular quantum device, which achieves qubit coupling between modules through a tunable longer-range coupling scheme. The experimental results show that sub-100-ns two-qubit gates can be achieved for qubits housed in nearby modules that are spatially separated by more than two centimeters. This modular architecture and coupling scheme provide a promising foundation for large-scale quantum information processing with superconducting qubits.

APPLIED PHYSICS LETTERS (2022)

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Article Quantum Science & Technology

High fidelity two-qubit gates on fluxoniums using a tunable coupler

Ilya N. Moskalenko et al.

Summary: Researchers presented a two-qubit fluxonium-based quantum processor, demonstrating fSim-type and controlled-Z gates with fidelities of 99.55% and 99.23%, respectively, while suppressing residual ZZ interaction to the few kHz levels. High-fidelity single-qubit gates and ground state initialization were achieved using a galvanically coupled flux control line.

NPJ QUANTUM INFORMATION (2022)

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Article Physics, Applied

Double-Transmon Coupler: Fast Two-Qubit Gate with No Residual Coupling for Highly Detuned Superconducting Qubits

Hayato Goto

Summary: This article introduces a tunable coupler called a double-transmon coupler, which achieves fast high-fidelity two-qubit gates by controlling the magnetic flux and avoids residual coupling during idle time. This approach offers an alternative solution for improving the performance of superconducting quantum computers.

PHYSICAL REVIEW APPLIED (2022)

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Article Physics, Applied

Tunable coupling scheme for implementing two-qubit gates on fluxonium qubits

I. N. Moskalenko et al.

Summary: A superconducting fluxonium circuit utilizes a large inductance to suppress charge and flux sensitivity, with large and positive anharmonicity for better separation between qubit states. A tunable coupling scheme is proposed for implementing two-qubit gates, with performance evaluation through simulating fSim gates.

APPLIED PHYSICS LETTERS (2021)

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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)

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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)

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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)

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Article Physics, Applied

Parametric-Resonance Entangling Gates with a Tunable Coupler

Eyob A. Sete et al.

Summary: High-fidelity parametric resonance gates have been achieved by modulating the average frequency of superconducting qubits to resonate with a static-frequency qubit. This approach allows for flexibility in choosing modulation frequencies and avoiding frequency collisions, demonstrating the potential for improving quantum gate fidelity.

PHYSICAL REVIEW APPLIED (2021)

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Article Multidisciplinary Sciences

Breaking the trade-off between fast control and long lifetime of a superconducting qubit

S. Kono et al.

NATURE COMMUNICATIONS (2020)

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Article Physics, Multidisciplinary

Implementation of Conditional Phase Gates Based on Tunable ZZ Interactions

Michele C. Collodo et al.

PHYSICAL REVIEW LETTERS (2020)

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Article Physics, Multidisciplinary

High-Fidelity, High-Scalability Two-Qubit Gate Scheme for Superconducting Qubits

Yuan Xu et al.

PHYSICAL REVIEW LETTERS (2020)

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Article Engineering, Electrical & Electronic

Implementation of XY entangling gates with a single calibrated pulse

Deanna M. Abrams et al.

NATURE ELECTRONICS (2020)

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Article Optics

Fast parametric two-qubit gates with suppressed residual interaction using the second-order nonlinearity of a cubic transmon

Atsushi Noguchi et al.

PHYSICAL REVIEW A (2020)

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Article Quantum Science & Technology

Two-Qubit Circuit Depth and the Monodromy Polytope

Eric C. Peterson et al.

QUANTUM (2020)

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Article Multidisciplinary Sciences

Quantum supremacy using a programmable superconducting processor

Frank Arute et al.

NATURE (2019)

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Article Multidisciplinary Sciences

A blueprint for demonstrating quantum supremacy with superconducting qubits

C. Neill et al.

SCIENCE (2018)

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Article Multidisciplinary Sciences

Demonstration of universal parametric entangling gates on a multi-qubit lattice

Matthew Reagor et al.

SCIENCE ADVANCES (2018)

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Article Physics, Applied

Parametrically Activated Entangling Gates Using Transmon Qubits

S. A. Caldwell et al.

PHYSICAL REVIEW APPLIED (2018)

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Article Physics, Applied

Tunable Coupling Scheme for Implementing High-Fidelity Two-Qubit Gates

Fei Yan et al.

PHYSICAL REVIEW APPLIED (2018)

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Article Optics

Analytical modeling of parametrically modulated transmon qubits

Nicolas Didier et al.

PHYSICAL REVIEW A (2018)

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Comparing Experiments to the Fault-Tolerance Threshold

Richard Kueng et al.

PHYSICAL REVIEW LETTERS (2016)

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Article Physics, Applied

Universal Gate for Fixed-Frequency Qubits via a Tunable Bus

David C. McKay et al.

PHYSICAL REVIEW APPLIED (2016)

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Article Optics

Universal two-qubit interactions, measurement, and cooling for quantum simulation and computing

Eliot Kapit

PHYSICAL REVIEW A (2015)

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Article Optics

Fast adiabatic qubit gates using only σz control

John M. Martinis et al.

PHYSICAL REVIEW A (2014)

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Article Materials Science, Multidisciplinary

Tunable-cavity QED with phase qubits

J. D. Whittaker et al.

PHYSICAL REVIEW B (2014)

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Article Physics, Multidisciplinary

Qubit Architecture with High Coherence and Fast Tunable Coupling

Yu Chen et al.

PHYSICAL REVIEW LETTERS (2014)

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Article Physics, Multidisciplinary

Tunable Resonant and Nonresonant Interactions between a Phase Qubit and LC Resonator

M. S. Allman et al.

PHYSICAL REVIEW LETTERS (2014)

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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)

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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)

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Article Multidisciplinary Sciences

Quantum coherent tunable coupling of superconducting qubits

A. O. Niskanen et al.

SCIENCE (2007)

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Article Materials Science, Multidisciplinary

Tunable coupling scheme for flux qubits at the optimal point

AO Niskanen et al.

PHYSICAL REVIEW B (2006)

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Article Materials Science, Multidisciplinary

Parametric coupling for superconducting qubits

P Bertet et al.

PHYSICAL REVIEW B (2006)

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Article Optics

Universal quantum circuit for two-qubit transformations with three controlled-NOT gates

G Vidal et al.

PHYSICAL REVIEW A (2004)

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Article Optics

Natural two-qubit gate for quantum computation using the XY interaction -: art. no. 032301

N Schuch et al.

PHYSICAL REVIEW A (2003)

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Fast parametric two-qubit gate for highly detuned fixed-frequency superconducting qubits using a double-transmon coupler

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