arXiv quant-ph/02030312002-03-14quant-ph

Fock空间中连续变量态的相干性证明

On the coherence veryfication of the continuous variable state in Fock space

Wang Xiang-bin, Matsumoto Keiji, Tomita Akihisa

备注：: We give a scheme to distinguish the Rudolph-Sanders source and the van Enk-Fuchs source

摘要：

量子光学中几乎所有新的可观测现象都与量子相干性有关。这里的相干性是由状态内部的相对相位决定的。遗憾的是，到目前为止，量子光学中所有相关的实验结果都对相干态的相位信息不敏感。在量子光学的许多问题中，相位信息的缺失会导致严重的后果。例如，一个双模压缩态的系综是经典系综，如果每个态的相位是完全随机的;但如果每个态的相位是固定的，它是非经典系综。作为一种及时的应用，在双模压缩态系综中验证这种相位信息对于连续变量量子隐形传态（CVQT）实验的有效性至关重要。在这里，我们给出了一个简单的方案来区分两种不同的状态的系综：Ruffel-Sanders系综，其中每个压缩态发射的相位值从$0-2π$均匀分布;和van Enk-Fuchs系综，其中发射具有固定（但未知）的相位为每个状态的相同的状态。我们相信，我们的建议可以帮助我们更清楚地了解到目前为止，现有的双模压缩态是否确实是非经典态，可以作为纠缠资源。

英文摘要：

Almost all novel observable phenomena in quantum optics are related to the quantum coherence. The coherence here is determined by the relative phase inside a state. Unfortunately, so far all the relevant experimental results in quantum optics are insensitive to the phase information of the coherent state. Lack of phase information may cause serious consequences in many problems in quantum optics. For example, an ensemble of two mode squeezed states is a classical ensemble if the phase in each state is totally random; but it is a non-classical ensemble if the phase in each state is fixed. As a timly application, verification of this type of phase information in an ensemble of two mode squeezed states from the conventional laser is crucial to the validity of the continuous variavable quantum teleportation(CVQT) experiment. Here we give a simple scheme to distinguish two different ensemble of states: the Rudolph-Sanders ensemble, by which each squeezed states emitted has a uniform distribution from $0-2π$ on the phase value; and the van Enk-Fuchs ensemble, which emmits identical states with a fixed(but unknown) phase for every state. We believe our proposal can help to give a clear picture on whether the existing two mode squeezed states so far are indeed non-classical states which can be used as the entanglement resource.

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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