论文标题
通过差异信号放大的方式，无量子的精度计量学
Quantum-coherence-free precision metrology by means of difference-signal amplification
论文作者
论文摘要
精确计量学的新型弱值扩增（WVA）方案深深地植根于序列前和序列后状态之间破坏性干扰的量子性质。并且，已被认为是在选拔后接受和拒绝的结果中采用差异信号的替代版本，它在某些技术限制下（例如，误差错误）采用了差异信号。在这项工作中，在消除了量子相干性之后，我们分析了差异信号放大（DSA）技术，该技术是JWVA的经典对应物，并表明可以达到类似的放大效果。我们获得一个简单的表达式，用于放大信号，进行精确表征，并指出最佳的工作状态。我们还讨论了如何实施经典混合状态的选择后。拟议的古典DSA技术具有JWVA的类似技术优势，并且在实践中可能会发现有趣的应用。
The novel weak-value-amplification (WVA) scheme of precision metrology is deeply rooted in the quantum nature of destructive interference between the pre- and post-selection states. And, an alternative version, termed as joint WVA (JWVA), which employs the difference-signal from the post-selection accepted and rejected results, has been found possible to achieve even better sensitivity (two orders of magnitude higher) under some technical limitations (e.g. misalignment errors). In this work, after erasing the quantum coherence, we analyze the difference-signal amplification (DSA) technique, which serves as a classical counterpart of the JWVA, and show that similar amplification effect can be achieved. We obtain a simple expression for the amplified signal, carry out characterization of precision, and point out the optimal working regime. We also discuss how to implement the post-selection of a classical mixed state. The proposed classical DSA technique holds similar technical advantages of the JWVA and may find interesting applications in practice.
