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

张宇佳 ¹张钰 ¹李邵雄 ²郑文 ¹于扬²

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作者信息

1. National Laboratory of Solid State Microstructures,School of Physics,Nanjing University,Nanjing 210093,China;Shishan Laboratory,Suzhou Campus of Nanjing University,Suzhou 215163,China;Synergetic Innovation Center of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China
2. National Laboratory of Solid State Microstructures,School of Physics,Nanjing University,Nanjing 210093,China;Shishan Laboratory,Suzhou Campus of Nanjing University,Suzhou 215163,China;Synergetic Innovation Center of Quantum Information and Quantum Physics,University of Science and Technology of China,Hefei 230026,China;Hefei National Laboratory,Hefei 230088,China
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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)

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出版年

2024

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

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