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arXiv 2005.05739quant-ph
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相空间中超越负性的单模非经典性

Verifying single-mode nonclassicality beyond negativity in phase space

Jiyong Park, Jaehak Lee, Hyunchul Nha

摘要:

虽然相空间中的负性是非经典性的一个众所周知的特征,但各种各样的非经典态需要它们超越负性的表征。我们在相空间中建立了一个非经典性的框架,用直接的实验证据全面地描述了非经典态。这包括作为特例的负相空间分布,并进一步有效地分析了具有正相空间分布的量子态。我们证明了该方法只需检测相空间中的三个点,就能显著地检测出所有的非经典高斯态和任意维的所有非高斯态。我们的形式主义还提供了一个实验上可访问的下界的非经典措施的基础上跟踪距离。重要的是,这种基本方法可以进一步适用于构成实际的测试,在两个方向上寻找玻色子系统的粒子和波的性质,分别通过一个阵列的非理想开关检测器和粗粒度零差测量。所有这些测试在表征非经典状态时都是非常有效的,可以可靠地对抗噪声,为量子技术中的各种量子系统提供了通用工具。

英文摘要:

While negativity in phase space is a well-known signature of nonclassicality, a wide variety of nonclassical states require their characterization beyond negativity. We establish a framework of nonclassicality in phase space that addresses nonclassical states comprehensively with a direct experimental evidence. This includes the negativity of phase-space distribution as a special case and further analyzes quantum states with positive distributions effectively. We prove that it detects all nonclassical Gaussian states and all non-Gaussian states of arbitrary dimension remarkably by examining three phase-space points only. Our formalism also provides an experimentally accessible lower bound for a nonclassicality measure based on trace distance. Importantly, this foundational approach can be further adapted to constitute practical tests in two directions looking into particle and wave nature of bosonic systems, via an array of nonideal on-off detectors and coarse-grained homodyne measurement, respectively. All these tests are practically powerful in characterizing nonclasssical states reliably against noise, making a versatile tool for a broad range of quantum systems in quantum technologies.

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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