量子非退化测量的测量算子

IF 4.2 Q2 QUANTUM SCIENCE & TECHNOLOGY
E. Ilo-Okeke, Ping Chen, Shuang Li, B. C. Anusionwu, V. Ivannikov, T. Byrnes
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引用次数: 2

摘要

我们推导了一个与原子系综的量子非拆除(QND)测量相对应的测量算子。量子测量算子采用正算子值测量(POVM)的形式,对任意相互作用时间、初始相干态振幅和最终光子测量结果都有效。我们分析了对各种参数的依赖性,并表明在短的相互作用时间内,QND测量的效果是对初始状态波函数进行高斯调制。我们导出了各种极限下POVM的近似表达式,如短相互作用时间范围和投影测量极限。给出了几个例子,说明了如何利用测量产生自旋压缩态和薛定谔猫态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Measurement operator for quantum nondemolition measurements
We derive a measurement operator corresponding to a quantum nondemolition (QND) measurement of an atomic ensemble. The quantum measurement operator takes the form of a positive operator valued measure (POVM) and is valid for arbitrary interaction times, initial coherent state amplitudes, and final photon measurement outcomes. We analyze the dependence on various parameters and show that the effect of the QND measurement for short interaction times is to apply a Gaussian modulation of the initial state wavefunction. We derive approximate expressions for the POVM in various limits, such as the short interaction time regime and projective measurement limit. Several examples are shown, which show how spin squeezing and Schrodinger cat states can be generated using the measurement.
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CiteScore
9.90
自引率
0.00%
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