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arXiv 2201.03257quant-ph
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Wigner函数负性对耗散的鲁棒性

Robustness of negativity of the Wigner function to dissipation

B. Nugmanov, N. Zunikov, F. Ya. Khalili

摘要:

由负值Wigner函数描述的非高斯量子态对于量子物理的基本测试和新兴的量子信息技术都是重要的。然而,它们很容易消散。众所周知,只有当装置的总量子效率$η$高于1/2时,维格纳函数负性才可能存在。在这里,我们证明了这个条件不仅是必要的,而且是充分的:当这个条件满足时,否定性总是存在的。同时,在亮(多光子)非高斯量子态的情况下,负性对$η$的依赖性是高度非线性的。随着几个光子的丢失,它会下降几个数量级,阻碍其实验检测。

英文摘要:

Non-Gaussian quantum states, described by negative valued Wigner functions, are important both for fundamental tests of quantum physics and for emerging quantum information technologies. However, they are vulnerable to dissipation. It is known, that the Wigner functions negativity could exist only if the overall quantum efficiency $η$ of the setup is higher than 1/2. Here we prove that this condition is not only necessary but also a sufficient one: the negativity always persists while this condition is fulfilled. At the same time, in the case of bright (multi-photon) non-Gaussian quantum states, the negativity dependence on $η$ is highly non-linear. With the loss of several photons, it drops by orders of magnitude, hampering its experimental detection.

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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