Cat state, sub-Planck structure and weak measurement
Cat state, sub-Planck structure and weak measurement
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DOI：
10.1140/epjd/e2013-30592-9
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发表时间：
2013-05
期刊：
影响因子：
--
通讯作者：
A. K. Pan;P. Panigrahi
中科院分区：
文献类型：
--
作者：
A. K. Pan;P. Panigrahi
海森堡极限测量和弱测量是两个有趣的概念，近年来用于提高量子计量学测量的灵敏度。利用量子猫态，赋予亚普朗克结构，我们连接这两个新的概念。它表明，这两种现象表现在互补的制度，这取决于在考虑中的猫状态构成的介观状态之间的重叠程度。特别是，我们发现，当次普朗克结构的体现，虚弱值被掩盖，反之亦然。
Heisenberg-limited and weak measurements are the two intriguing notions, used in recent times for enhancing the sensitivity of measurements in quantum metrology. Using a quantum cat state, endowed with sub-Planck structure, we connect these two novel concepts. It is demonstrated that these two phenomena manifest in complementary regimes, depending upon the degree of overlap between the mesoscopic states constituting the cat state under consideration. In particular, we find that when sub-Planck structure manifests, the imaginary weak value is obscured and vice versa.