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arXiv quant-ph/0412158quant-ph
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受限操作下的纠缠:与混合态纠缠的类比

Entanglement under restricted operations: Analogy to mixed-state entanglement

Stephen D. Bartlett, Andrew C. Doherty, Robert W. Spekkens, H. M. Wiseman

摘要:

我们表明,当局部量子操作受到限制时,二分纯纠缠态的分类产生了一种在许多方面类似于混合态纠缠的结构。具体来说,我们开发了这种类比限制操作通过本地超选择规则,并表明,这种奇异的现象,如绑定纠缠和激活出现在这种设置中使用纯态。这个类比有助于解决限制操作下纠缠研究中的几个概念性难题。特别是,我们证明了几种类型的量子光学态,具有混乱的纠缠特性类似于束缚纠缠态。此外,在限制操作下的纯态纠缠的分类可以比混合态纠缠简单得多。例如,在局部阿贝尔超选择规则的情况下,所有关于可解性的问题都可以得到解决。

英文摘要:

We show that the classification of bi-partite pure entangled states when local quantum operations are restricted yields a structure that is analogous in many respects to that of mixed-state entanglement. Specifically, we develop this analogy by restricting operations through local superselection rules, and show that such exotic phenomena as bound entanglement and activation arise using pure states in this setting. This analogy aids in resolving several conceptual puzzles in the study of entanglement under restricted operations. In particular, we demonstrate that several types of quantum optical states that possess confusing entanglement properties are analogous to bound entangled states. Also, the classification of pure-state entanglement under restricted operations can be much simpler than for mixed-state entanglement. For instance, in the case of local Abelian superselection rules all questions concerning distillability can be resolved.

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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