高NOON态中纠缠猝死的不存在性
Nonexistence of Entanglement Sudden Death in High NOON States
摘要：
我们研究了连续变量量子系统（CVQS）中的纠缠动力学。具体而言，我们研究了一般双模N光子态在纯退相过程中的纠缠猝死（ESD）现象。我们表明，对于这些国家，ESD从来没有发生。这些状态是所谓的高NOON状态的概括，示出了将λ的瑞利极限降低到λ/N，这保证了如果具有大N的状态在物理上实现则干涉图案的分辨率的极大改善。然而，我们发现，在失相NOON状态下，达到临界可见度V_crit的时间与N^2成反比。在实践层面上，这表明随着N的增加，可见性下降得更快，这可能是这些状态的任何实际应用的一个相当大的缺点。
英文摘要：
We study the dynamics of entanglement in continuous variable quantum systems (CVQS). Specifically, we study the phenomena of Entanglement Sudden Death (ESD) in general two-mode-N-photon states undergoing pure dephasing. We show that for these states, ESD never occurs. These states are generalizations of the so-called High NOON states, shown to decrease the Rayleigh limit of lambda to lambda/N, which promises great improvement in resolution of interference patterns if states with large N are physically realized. However, we show that in dephasing NOON states, the time to reach V_crit, critical visibility, scales inversely with N^2. On the practical level, this shows that as N increases, the visibility degrades much faster, which is likely to be a considerable drawback for any practical application of these states.
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