Experimental revival of an unknown state from the past in quantum walks  

作　　者：Bingzi Huo Dengke Qu Quan Lin Gaoyan Zhu Lei Xiao Xiang Zhan Peng Xue 

机构地区：[1]Beijing Computational Science Research Center,Beijing 100193,China [2]School of Physics,Southeast University,Nanjing 211189,China [3]College of Electronic and Information Engineering,Shandong University of Science and Technology,Qingdao 266590,China

出　　处：《National Science Review》2025年第1期12-18,共7页国家科学评论(英文版)

基　　金：supported by the National Natural Science Foundation of China(12025401,92265209,12305008 and 12104036);D.Q.receives support from the China Postdoctoral Science Foundation(BX20230036 and 2023M730198).

摘　　要：The physical process in the macroscopic world unfolds along a single time direction,while the evolution of a quantum system is reversible in principle.How to recover a quantum system to its past state is a complex issue of both fundamental and practical interests.In this article,we experimentally demonstrate a novel method for recovering the state in quantum walks(QWs),also known as full-state revival.Moreover,we observe two other important phenomena in QWs,recurrence and periodicity,via simplifying and repeatedly implementing the scheme,respectively.Our experiments show that obtaining these phenomena requires neither any information of the initial state nor full information of the coin operations.Our work sheds new light on quantum state engineering and recovery,and the initialization of quantum devices based on QWs.

关 键 词：quantum walk quantum state revival quantum state engineering 

分 类 号：O41[理学—理论物理]