Measuring Small Longitudinal Phase Shifts: Weak Measurements or Standard Interferometry?
Measuring Small Longitudinal Phase Shifts: Weak Measurements or Standard Interferometry?
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DOI：
10.1103/physrevlett.105.010405
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发表时间：
2010-07-02
影响因子：
8.6
通讯作者：
Simon, Christoph
中科院分区：
文献类型：
--
作者：
Brunner, Nicolas;Simon, Christoph
最近，弱测量被用来测量横向于光束传播方向的小效应。在这里，我们解决弱测量对于测量小的纵向相移是否也有用的问题。我们表明，在涉及纯实弱值的情况下，标准干涉测量法的性能大大优于弱测量法。然而，我们还提出了一种基于纯虚弱值并结合频域分析的干涉测量方案，该方案可能比标准干涉测量好几个数量级。
Recently, weak measurements were used to measure small effects that are transverse to the propagation direction of a light beam. Here we address the question of whether weak measurements are also useful for measuring small longitudinal phase shifts. We show that standard interferometry greatly outperforms weak measurements in a scenario involving a purely real weak value. However, we also present an interferometric scheme based on a purely imaginary weak value, combined with a frequency-domain analysis, which may have the potential to outperform standard interferometry by several orders of magnitude.