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arXiv quant-ph/0310124quant-ph
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存在超选择规则时的非本地资源

Nonlocal resources in the presence of Superselection Rules

N. Schuch, F. Verstraete, J. I. Cirac

摘要:

超选择规则严重地改变了可以在分布式量子系统上实现的可能操作。而由二分设置施加的本地操作的限制引起的概念的纠缠作为一个非本地资源,超选择规则与粒子数守恒导致一个新的资源,本地粒子数的\emph{superselection induced variance}。我们证明了在纯量子态的情况下,仅用两个可加测度就可以量化非定域性质,并且具有相同测度的所有态可以通过局域操作和经典通信渐近地相互转换.此外,我们还讨论了超选择规则如何影响控制、隐形传态和混合态纠缠等概念。

英文摘要:

Superselection rules severely alter the possible operations that can be implemented on a distributed quantum system. Whereas the restriction to local operations imposed by a bipartite setting gives rise to the notion of entanglement as a nonlocal resource, the superselection rule associated with particle number conservation leads to a new resource, the \emph{superselection induced variance} of local particle number. We show that, in the case of pure quantum states, one can quantify the nonlocal properties by only two additive measures, and that all states with the same measures can be asymptotically interconverted into each other by local operations and classical communication. Furthermore we discuss how superselection rules affect the concepts of majorization, teleportation and mixed state entanglement.

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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