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arXiv quant-ph/0005022quant-ph
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用于量子隐形传态的非对称量子信道

Asymmetric quantum channel for quantum teleportation

M. S. Kim, Jinhyoung Lee

摘要:

实现连续变量态的非理想量子隐形传态存在一些障碍,如无法获得最大纠缠双模压缩态、接收端的探测效率低以及不理想的幺正变换等。我们表明,所有这些障碍可以理解的{ \it非对称解相干}量子信道和其他操作的完美装置的组合。对于非对称退相干的量子信道,我们发现了一些与直觉相反的结果:一是信道的初始压缩程度越高,隐形传态就越好;二是当量子信道的一个分支不可避免地受到某些不完美操作的影响时,盲目地使另一个分支尽可能干净并不一定能得到最好的隐形传态结果.我们找到了最佳的策略来传送一个未知的字段为一个给定的环境或为一个给定的初始压缩的通道。

英文摘要:

There are a few obstacles, which bring about imperfect quantum teleportation of a continuous variable state, such as unavailability of maximally entangled two-mode squeezed states, inefficient detection and imperfect unitary transformation at the receiving station. We show that all those obstacles can be understood by a combination of an {\it asymmetrically-decohered} quantum channel and perfect apparatuses for other operations. For the asymmetrically-decohered quantum channel, we find some counter-intuitive results; one is that teleportation does not necessarily get better as the channel is initially squeezed more and another is when one branch of the quantum channel is unavoidably subject to some imperfect operations, blindly making the other branch as clean as possible may not result in the best teleportation result. We find the optimum strategy to teleport an unknown field for a given environment or for a given initial squeezing of the channel.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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