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arXiv 0904.0956quant-ph
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量子存储中的纠缠猝死

Entanglement Sudden Death in a Quantum Memory

Yaakov S. Weinstein

摘要:

我探讨纠缠动力学的量子存储器,消相干自由子空间(DFS)和无噪声子系统(NS)的例子,以确定如何完全失去纠缠影响这些技术的能力,以保护量子信息。利用负性和纠缠度作为纠缠度量,发现系统中纠缠的完全丧失与所存储的量子信息的保真度之间一般没有相关性。这些结果补充了以前的结果,其中量子协议不显式地基于纠缠表现出ESD和给定协议的准确性之间的相关性很小。

英文摘要:

I explore entanglement dynamics in examples of quantum memories, decoherence free subspaces (DFS) and noiseless subsystems (NS), to determine how a complete loss of entanglement affects the ability of these techniques to protect quantum information. Using negativity and concurrence as entanglement measures, I find that in general there is no correlation between the complete loss of entanglement in the system and the fidelity of the stored quantum information. These results complement previous results in which quantum protocols not explictly based on entanglement exhibit little correlation between ESD and the accuracy of the given protocol.

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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