Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Bulletin of the American Physical Society

Cancellation of unwanted ZZ interactions for cross-resonance gates by superconducting qubit engineering

Roni Winik, Catherine Leroux, Agustín Di Paolo, Thomas Hazard, Ross Shillito, Antti P. Vepsäläinen, Youngkyu Sung, Ziqiao Ao, Morten Kjærgaard, Jochen Braumüller, Mollie E. Schwartz, Kyle Serniak, David K. Kim, Jonilyn Yoder, Alexander J. Melville, Bethany M. Niedzielski, Alexandre Blais, Simon Gustavsson, William D. Oliver

Published Mar 17, 2021• 0 citations
OpenAlex

Related papers

Cancellation of unwanted ZZ interactions by superconducting qubit engineering

Roni Winik, Catherine Leroux, Agustín Di Paolo +10 more

Bulletin of the American Physical Society•Mar 5, 2020•0 citations

Controlling superconducting qubits in the presence of a strong, constant ZZ interaction

Seth Merkel

Bulletin of the American Physical Society•Feb 29, 2012•0 citations

Fast ZZ-Free Entangling Gates for Superconducting Qubits Assisted by a Driven Resonator

Ziwen Huang

•Mar 1, 2024•0 citations

Suppression of Unwanted Z Z Interactions in a Hybrid Two-Qubit System

Jaseung Ku, Xuexin Xu, Markus Brink +4 more

Mitigating crosstalk errors, whether classical or quantum mechanical, is critically important for achieving high-fidelity entangling gates in multiqubit circuits. For weakly anharmonic superconducting qubits, unwanted ZZ interactions can be suppressed by combining qubits with opposite anharmonicity. We present experimental measurements and theoretical modeling of two-qubit gate error for gates based on the cross resonance interaction between a capacitively shunted flux qubit and a transmon, and demonstrate the elimination of the ZZ interaction.

arXiv:2003.02775•Physical Review Letters•Nov 11, 2020•111 citations

Understanding and improving the cross resonance gate in superconducting qubits

Sarah Sheldon, Easwar Magesan, Jerry M. Chow +1 more

Bulletin of the American Physical Society•Mar 15, 2016•0 citations

Fast ZZ-Free Entangling Gates for Superconducting Qubits Assisted by a Driven Resonator

Ziwen Huang, Tae-Yoon Kim, Tanay Roy +4 more

Engineering high-fidelity two-qubit gates is an indispensable step toward practical quantum computing. For superconducting quantum platforms, one important setback is the stray interaction between qubits, which causes significant coherent errors. For transmon qubits, protocols for mitigating such errors usually involve fine-tuning the hardware parameters or introducing usually noisy flux-tunable couplers. In this work, we propose a simple scheme to cancel these stray interactions. The coupler used for such cancellation is a driven high-coherence resonator, where the amplitude and frequency of the drive serve as control knobs. Through the resonator-induced-phase (RIP) interaction, the static ZZ coupling can be entirely neutralized. We numerically show that such a scheme can enable short and high-fidelity entangling gates, including cross-resonance CNOT gates within 40 ns and adiabatic CZ gates within 140 ns. Our architecture is not only ZZ free but also contains no extra noisy components, such that it preserves the coherence times of fixed-frequency transmon qubits. With the state-of-the-art coherence times, the error of our cross-resonance CNOT gate can be reduced to below 1e-4.

arXiv:2311.01332•Nov 2, 2023•0 citations
Mitigating crosstalk errors, whether classical or quantum mechanical, is critically important for achieving high-fidelity entangling gates in multiqubit circuits. For weakly anharmonic superconducting qubits, unwanted ZZ interactions can be suppressed by combining qubits with opposite anharmonicity. We present experimental measurements and theoretical modeling of two-qubit gate error for gates based on the cross resonance interaction between a capacitively shunted flux qubit and a transmon, and demonstrate the elimination of the ZZ interaction.
Engineering high-fidelity two-qubit gates is an indispensable step toward practical quantum computing. For superconducting quantum platforms, one important setback is the stray interaction between qubits, which causes significant coherent errors. For transmon qubits, protocols for mitigating such errors usually involve fine-tuning the hardware parameters or introducing usually noisy flux-tunable couplers. In this work, we propose a simple scheme to cancel these stray interactions. The coupler used for such cancellation is a driven high-coherence resonator, where the amplitude and frequency of the drive serve as control knobs. Through the resonator-induced-phase (RIP) interaction, the static ZZ coupling can be entirely neutralized. We numerically show that such a scheme can enable short and high-fidelity entangling gates, including cross-resonance CNOT gates within 40 ns and adiabatic CZ gates within 140 ns. Our architecture is not only ZZ free but also contains no extra noisy components, such that it preserves the coherence times of fixed-frequency transmon qubits. With the state-of-the-art coherence times, the error of our cross-resonance CNOT gate can be reduced to below 1e-4.