Measuring Loschmidt echo via Floquet engineering in superconducting circuits

• 作者: Shou-Kuan Zhao Zi-Yong Ge Zhong-Cheng Xiang Guang-Ming Xue Hai-Sheng Yan Zi-Ting Wang Zhan Wang Hui-Kai Xu Fei-Fan Su Zhao-Hua Yang He Zhang Yu-Ran Zhang Xue-Yi Guo Kai Xu Ye Tian Hai-Feng Yu Dong-Ning Zheng Heng Fan Shi-Ping Zhao
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2022,（3）
• 所属期刊栏目: RAPID COMMUNICATION
• 页码范围: 129-133
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/1674-1056/ac40f8

摘要

The Loschmidt echo is a useful diagnostic for the perfection of quantum time-reversal process and the sensitivity of quantum evolution to small perturbations.The main challenge for measuring the Loschmidt echo is the time reversal of a quantum evolution.In this work,we demonstrate the measurement of the Loschmidt echo in a superconducting 10-qubit system using Floquet engineering and discuss the imperfection of an initial Bell-state recovery arising from the next-nearest-neighbor(NNN)coupling present in the qubit device.Our results show that the Loschmidt echo is very sensitive to small perturbations during quantum-state evolution,in contrast to the quantities like qubit population that is often considered in the time-reversal experiment.These properties may be employed for the investigation of multiqubit system concerning many-body decoherence and entanglement,etc.,especially when devices with reduced or vanishing NNN coupling are used.