Entanglement in single-particle systems
Entanglement in single-particle systems
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单粒子系统中的纠缠
DOI：
10.1098/rspa.2007.1887
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
V. Vedral
中科院分区：
文献类型：
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作者：
M. T. Cunha;J. Dunningham;V. Vedral
我们解决了一些最常见的关于纠缠的问题，特别是关于所谓的职业号码纠缠。为了明确回答纠缠是否可以存在于单原子离域状态，我们提出了一项实验，能够仅使用该状态和局部操作来证明贝尔不等式的违反。我们回顾了之前关于单光子非定域性的讨论，并提出了一种创建单原子纠缠态的具体实验，表明原子数的超选择规则是可以克服的。作为副产品，该实验提出了一种创建两种不同化学物质纠缠态的方法。通过与无质量系统相比，我们认为对这种叠加应该没有根本性的反对，并且它的创造可能是现有技术所能达到的。
We address some of the most commonly raised questions about entanglement, especially with regard to the so-called occupation number entanglement. To answer unambiguously whether entanglement can exist in a one-atom delocalized state, we propose an experiment capable of showing violations of Bell's inequality using only this state and local operations. We review previous discussions for one-photon non-locality and propose a specific experiment for creating one-atom entangled states, showing that the superselection rule of atom number can be overcome. As a by-product, this experiment suggests a means of creating an entangled state of two different chemical species. By comparison with a massless system, we argue that there should be no fundamental objection to such a superposition and its creation may be within reach of present technology.