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

Jaseung Ku, Xuexin Xu, Markus Brink, David C. McKay, Jared B. Hertzberg, Mohammad H. Ansari, and B. L. T. Plourde
Phys. Rev. Lett. 125, 200504 – Published 11 November 2020
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Abstract

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.

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  • Received 8 April 2020
  • Accepted 2 September 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.200504

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Jaseung Ku1, Xuexin Xu2,3, Markus Brink4, David C. McKay4, Jared B. Hertzberg4, Mohammad H. Ansari2,3, and B. L. T. Plourde1,*

  • 1Department of Physics, Syracuse University, Syracuse, New York 13244, USA
  • 2Peter Grünberg Institute, Forschungszentrum Jülich, Jülich 52428, Germany
  • 3Jülich-Aachen Research Alliance (JARA), Fundamentals of Future Information Technologies, Jülich 52428, Germany
  • 4IBM Quantum, IBM T.J. Watson Research Center, Yorktown Heights, New York 10598, USA

  • *Corresponding author. bplourde@syr.edu

See Also

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

Peng Zhao, Peng Xu, Dong Lan, Ji Chu, Xinsheng Tan, Haifeng Yu, and Yang Yu
Phys. Rev. Lett. 125, 200503 (2020)

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Vol. 125, Iss. 20 — 13 November 2020

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