Nonlocal advantage of quantum coherence in a dephasing channel with memory  

作　　者：Ming-Liang Hu Yu-Han Zhang Heng Fan 胡明亮;张宇晗;范桁(School of Science,Xi’an University of Posts and Telecommunications,Xi’an 710121,China;Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]School of Science,Xi’an University of Posts and Telecommunications,Xi’an 710121,China [2]Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [3]CAS Center for Excellence in Topological Quantum Computation,University of Chinese Academy of Sciences,Beijing 100190,China [4]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Chinese Physics B》2021年第3期68-73,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11675129,11774406,and 11934018);the National Key R&D Program of China(Grant Nos.2016YFA0302104 and 2016YFA0300600);the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB28000000);the Research Program of Beijing Academy of Quantum Information Sciences(Grant No.Y18G07).

摘　　要：We investigate nonlocal advantage of quantum coherence(NAQC)in a correlated dephasing channel modeled by themultimode bosonic reservoir.We obtain analytically the dephasing and memory factors of this channel for the reservoirhaving a Lorentzian spectral density,and analyze how they affect the NAQC defined by the l1 norm and relative entropy.It is shown that the memory effects of this channel on NAQC are state-dependent,and they suppress noticeably the rapiddecay of NAQC for the family of input Bell-like states with one excitation.For the given transmission time of each qubit,we also obtain the regions of the dephasing and memory factors during which there is NAQC in the output states.

关 键 词：quantum coherence correlated quantum channel memory effects 

分 类 号：O413[理学—理论物理]