Mocking up a Dephasing Channel with a Minimal-Sized Environment  

作　　者：WU Zhen 吴珍(State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan 430071;Graduate School of the Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan 430071 [2]Graduate School of the Chinese Academy of Sciences,Beijing 100049

出　　处：《Chinese Physics Letters》2012年第8期25-28,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 10974225;the National Basic Research Program of China under Grant No 2012CB922102.

摘　　要：In order to model the most general quantum operation on a d-dimensional system,a d^(2)-dimensional environment is usually needed.We focus on the quantum dephasing process and find that this channel can be modeled by an environment with the size of at most d dimensions.An experimentally accessible matrix D is defined to characterize the dephasing channel and the minimal number of Kraus operators of the channel from the matrix D for mocking up the dephasing channel is presented in the minimal-sized environment.An experimental simulation of dephasing channels by means of nuclear magnetic resonance techniques is carried out to justify the idea.

关 键 词：QUANTUM OPERATORS MATRIX 

分 类 号：O41[理学—理论物理]