Faithful and efficient hyperentanglement purification for spatial-polarization-time-bin photon system  

作　　者：杜芳芳 樊钢 吴一鸣 任宝藏 Fang-Fang Du;Gang Fan;Yi-Ming Wu;Bao-Cang Ren(Science and Technology on Electronic Test and Measurement Laboratory,North University of China,Taiyuan 030051,China;Department of Physics,Capital Normal University,Beijing 100048,China)

机构地区：[1]Science and Technology on Electronic Test and Measurement Laboratory,North University of China,Taiyuan 030051,China [2]Department of Physics,Capital Normal University,Beijing 100048,China

出　　处：《Chinese Physics B》2023年第6期140-150,共11页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.61901420 and 11604226);the Shanxi Province Science Foundation for Youths(Grant No.201901D211235);the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(Grant No.2019L0507);the Program of Beijing Municipal Commission of Education of China(Grant Nos.CIT&TCD201904080 and KM201810028005)。

摘　　要：We present a faithful and efficient hyperentanglement purification protocol(hyper-EPP)for nonlocal two-photon systems in spatial-polarization-time-bin hyperentangled Bell states.As the single-photon detectors can detect and herald the undesirable properties caused by side leakage and finite coupling strength,the parity-check gates and swap gates of our hyper-EPP in the spatial,polarization and time-bin mode degrees of freedom(DoFs)work faithfully.The qubit-flip errors in photon systems in three DoFs can be corrected effectively with the faithful parity-check gates and the photon pairs can be reused to distill high-fidelity ones by introducing the faithful swap gates,which greatly increases the efficiency of our hyper-EPP.Further,the maximal hyperentanglement can be obtained in principle by operating multiple rounds of the hyper-EPP.

关 键 词：quantum communication hyperentanglement purification photon system multiple degrees of freedom 

分 类 号：O413[理学—理论物理] TP38[理学—物理]