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arXiv 1801.04764quant-ph
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单囚禁离子相空间位移参数的量子传感

Quantum sensing of the phase space displacement parameters using a single trapped ion

Peter A. Ivanov, Nikolay V. Vitanov

摘要:

介绍了一种利用单个囚禁离子作为量子探针来检测表征相空间位移的参数的量子传感方案。我们表明,由于激光诱导的离子的内部状态和运动模式之间的耦合的两个共轭参数描述的位移的估计,可以有效地执行由一组测量的原子状态的人口。此外,我们介绍了一个三参数协议能够检测的幅度,横向和相位的位移。我们描述的两个和三个参数的问题的不确定性的Fisher信息,并表明,状态投影测量饱和的基本量子克拉美罗界。

英文摘要:

We introduce a quantum sensing protocol for detecting the parameters characterizing the phase space displacement by using a single trapped ion as a quantum probe. We show that thanks to the laser-induced coupling between the ion's internal states and the motion mode the estimation of the two conjugated parameters describing the displacement can be efficiently performed by a set of measurements of the atomic state populations. Furthermore, we introduce a three-parameter protocol capable to detect the magnitude, the transverse direction and the phase of the displacement. We characterize the uncertainty of the two- and three-parameter problems in terms of the Fisher information and show that state projective measurement saturates the fundamental quantum Cramer-Rao bound.

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