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-nearestneighbor(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.
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
赵寿宽;葛自勇;相忠诚;薛光明;严海生;王子婷;王战;徐晖凯;宿非凡;杨钊华;张贺;张煜然;郭学仪;许凯;田野;于海峰;郑东宁;范桁;赵士平(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Beijing Academy of Quantum Information Sciences,Beijing 100193,China;Theoretical Quantum Physics Laboratory,RIKEN Cluster for Pioneering Research,Wako-shi,Saitama 351-0198,Japan;CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)
基金
supported in part by the Key-Area Research and Development Program of Guang-Dong Province, China (Grant No. 2018B030326001)
the National Key R&D Program of China (Grant No. 2017YFA0304300)
supported by the Japan Society for the Promotion of Science (JSPS) (Postdoctoral Fellowship via Grant No. P19326, and KAKENHI via Grant No. JP19F19326)
support from the Natural Science Foundation of Beijing, China (Grant No. Z190012)
the National Natural Science Foundation of of China (Grant No. 11890704)
support from the National Natural Science Foundation of China (Grant No. T2121001)
Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB28000000)
Beijing Natural Science Foundation, China (Grant No. Z200009)。
