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

作　　者：Yujia Zhang Yu Zhang Shaoxiong Li Wen Zheng Yang Yu 张宇佳;张钰;李邵雄;郑文;于扬(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)

机构地区：[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

出　　处：《Chinese Physics B》2024年第11期207-211,共5页中国物理B（英文版）

基　　金：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);the Natural Science Foundation of Shandong Province(Grant No.ZR2023LZH002).

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) 

分 类 号：O413[理学—理论物理] TN40[理学—物理]