噪声环境下基于两体纠缠态的远程态制备  

Remote state preparation with bipartite entangled states in noisy environments

作　　者：梁华秋[1,2] 刘金明[1] 

机构地区：[1]华东师范大学物理系精密光谱科学与技术国家重点实验室,上海200062 [2]台州学院物理与电子工程学院物理系,台州318000

出　　处：《物理学报》2009年第6期3692-3698,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60708003,60578050);国家重点基础研究计划(批准号:2006CB921604);上海市重点基础研究计划(批准号:07JC14017);浙江省教育厅科研计划(批准号:Y200803630)资助的课题~~

摘　　要：本文研究了量子噪声对分别以Einstein-Podolsky-Rosen(EPR)态和两体部分纠缠态作为量子信道来远程制备单比特态的量子过程的影响.通过求解Lindblad形式的主方程,得到量子信道随时间的演化,采用迹距离来度量不同噪声情况下输出态与初态的接近程度.研究表明,作用在z方向的噪声对远程态制备的影响最弱,而同时作用在x,y,z方向的噪声对远程态制备的影响最强.We investigate the influence of quantum noises on the processes of remote preparation of a qubit by using an Einstein-Podolsky-Rosen （EPR） state and a bipartite partially entangled state as the quantum channel respectively. By solving the master equation in the Lindblad form, we obtain the time evolution of the quantum channels. Then we use the trace distance to describe how close the output state and the initial state are in various noisy conditions. Our results show that the influence of the noise acting on z direction is the weakest, and the influence of the noises acting simultaneously on x, y, and z directions is the strongest.

关 键 词：远程态制备 迹距离 纠缠态 噪声信道 

分 类 号：O413.1[理学—理论物理]