弱测量中相互作用强度影响的研究
Investigating the Effects of the Interaction Intensity in a Weak Measurement
摘要：
测量在量子力学、基础研究以及量子精密测量、量子增强测量和其他量子技术等应用领域中至关重要。近年来，基于弱相互作用的协议，如弱测量和保护测量已经在实验上实现，显示出独特的功能，导致在几个不同的应用程序中的惊人的优势。在这项工作中，我们分析的有效性范围内，这样的测量协议，即如何相互作用强度影响的弱值提取，通过测量不同的偏振弱值上测量预示单光子。我们表明，即使在弱相互作用制度，耦合强度限制了可实现的弱值的范围，把一个阈值的信号放大效应，利用在许多弱测量为基础的实验。
英文摘要：
Measurements are crucial in quantum mechanics, in fundamental research as well as in applicative fields like quantum metrology, quantum-enhanced measurements and other quantum technologies. In the recent years, weak-interaction-based protocols like Weak Measurements and Protective Measurements have been experimentally realized, showing peculiar features leading to surprising advantages in several different applications. In this work we analyze the validity range for such measurement protocols, that is, how the interaction strength affects the weak value extraction, by measuring different polarization weak values measured on heralded single photons. We show that, even in the weak interaction regime, the coupling intensity limits the range of weak values achievable, putting a threshold on the signal amplification effect exploited in many weak measurement based experiments.
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