中国物理B ›› 2024, Vol. 33 ›› Issue (11): 110306-110306.doi: 10.1088/1674-1056/ad73b3

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Diagnosing quantum crosstalk in superconducting quantum chips by using out-of-time-order correlators

Yujia Zhang(张宇佳)1,2,3, Yu Zhang(张钰)1,2,3,†, Shaoxiong Li(李邵雄)1,2,3,4, Wen Zheng(郑文)1,2,3, and Yang Yu(于扬)1,2,3,4   

  1. 1 National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China;
    2 Shishan Laboratory, Suzhou Campus of Nanjing University, Suzhou 215163, China;
    3 Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
    4 Hefei National Laboratory, Hefei 230088, China
  • 收稿日期:2024-06-11 修回日期:2024-08-19 接受日期:2024-08-27 出版日期:2024-11-15 发布日期:2024-11-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12074179 and U21A20436), the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0301702), the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BE2021015-1 and BK20232002), and the Natural Science Foundation of Shandong Province (Grant No. ZR2023LZH002).

Diagnosing quantum crosstalk in superconducting quantum chips by using out-of-time-order correlators

Yujia Zhang(张宇佳)1,2,3, Yu Zhang(张钰)1,2,3,†, Shaoxiong Li(李邵雄)1,2,3,4, Wen Zheng(郑文)1,2,3, and Yang Yu(于扬)1,2,3,4   

  1. 1 National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China;
    2 Shishan Laboratory, Suzhou Campus of Nanjing University, Suzhou 215163, China;
    3 Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
    4 Hefei National Laboratory, Hefei 230088, China
  • Received:2024-06-11 Revised:2024-08-19 Accepted:2024-08-27 Online:2024-11-15 Published:2024-11-15
  • Contact: Yu Zhang E-mail:smutnauq@nju.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12074179 and U21A20436), the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0301702), the Natural Science Foundation of Jiangsu Province, China (Grant Nos. BE2021015-1 and BK20232002), and the Natural Science Foundation of Shandong Province (Grant No. ZR2023LZH002).

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摘要： Performance of a scalable quantum processor critically relies on minimizing crosstalk and unwanted interactions within the system, as it is vital for parallel controlled operations on qubits. We present a protocol not only to provide information about residual coupling but also to effectively discriminate it from the influence of classical crosstalk. Our approach utilizes out-of-time-order correlators (OTOCs) as a signal of quantum crosstalk, making it applicable to various coupling forms and scalable architectures. To demonstrate the effectiveness of our protocol, we provide a theoretical analysis and simulate its implementation in coupled superconducting qubits.

关键词: superconducting qubit, crosstalk, out-of-time-order correlator (OTOC)

Abstract: Performance of a scalable quantum processor critically relies on minimizing crosstalk and unwanted interactions within the system, as it is vital for parallel controlled operations on qubits. We present a protocol not only to provide information about residual coupling but also to effectively discriminate it from the influence of classical crosstalk. Our approach utilizes out-of-time-order correlators (OTOCs) as a signal of quantum crosstalk, making it applicable to various coupling forms and scalable architectures. To demonstrate the effectiveness of our protocol, we provide a theoretical analysis and simulate its implementation in coupled superconducting qubits.

Key words: superconducting qubit, crosstalk, out-of-time-order correlator (OTOC)

中图分类号:  (Quantum computation architectures and implementations)

  • 03.67.Lx
85.25.Cp (Josephson devices) 02.70.-c (Computational techniques; simulations)