Entanglement and nonlocality of a single relativistic particle
Entanglement and nonlocality of a single relativistic particle
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DOI：
10.1103/physreva.80.044302
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发表时间：
2009-10-01
影响因子：
2.9
通讯作者：
Vedral, Vlatko
中科院分区：
文献类型：
--
作者：
Dunningham, Jacob;Palge, Veiko;Vedral, Vlatko
最近的研究表明，纠缠和非定域性的概念必须认真对待，即使在系统中只由一个粒子。然而，这些处理是非相对论性的，而且，如果单粒子纠缠是基本的，它也应该坚持相对论性的描述。在这里，我们考虑一个自旋为1/2的粒子在两个不同的速度叠加观察者在相对论增强惯性系，并表明，两个速度模式之间的纠缠生存的权利，以光速。我们还讨论了如何量子门可以实现这种方式，并将我们的结果的超导体的情况下。特别是，我们表明，一个s波超导体将有p波分量的助推观察员。
Recent work has argued that the concepts of entanglement and nonlocality must be taken seriously even in systems consisting of only a single particle. These treatments, however, are nonrelativistic, and, if single-particle entanglement is fundamental, it should also persist in a relativistic description. Here, we consider a spin-1/2 particle in a superposition of two different velocities as viewed by an observer in a relativistically boosted inertial frame and show that the entanglement between the two velocity modes survives right up to the speed of light. We also discuss how quantum gates could be implemented in this way and apply our results to the case of a superconductor. In particular, we show that an s-wave superconductor would have p-wave components for a boosted observer.