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arXiv quant-ph/0612050quant-ph
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重分布多体量子态的精确代价

The exact cost of redistributing multipartite quantum states

Igor Devetak, Jon Yard

摘要:

从第三个量子系统的角度来看,两个量子系统之间的相关性如何?我们回答这个问题,提供了一个最佳的量子态再分配协议的多方产品来源。具体来说,给定一个任意的量子态的三个系统,其中爱丽丝持有两个和鲍勃持有一个,我们确定的成本,在量子通信和纠缠,爱丽丝给她的一部分,鲍勃。通信成本给出了量子条件互信息的第一个已知的操作解释。最优过程在时间反演下是自对偶的,并且是完全可组合的。这推广了已知的协议,如状态合并和全量子Slepian-Wolf协议,量子香农理论中几乎所有已知的协议都可以从中导出。

英文摘要:

How correlated are two quantum systems from the perspective of a third? We answer this by providing an optimal quantum state redistribution protocol for multipartite product sources. Specifically, given an arbitrary quantum state of three systems, where Alice holds two and Bob holds one, we identify the cost, in terms of quantum communication and entanglement, for Alice to give one of her parts to Bob. The communication cost gives the first known operational interpretation to quantum conditional mutual information. The optimal procedure is self-dual under time reversal and is perfectly composable. This generalizes known protocols such as the state merging and fully quantum Slepian-Wolf protocols, from which almost every known protocol in quantum Shannon theory can be derived.

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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