Laser Physics ( IF 1.2 ) Pub Date : 2021-08-10 , DOI: 10.1088/1555-6611/ac1437 Yurong Liu , Zhaoxue Li , Yucheng Ye , Junhao Ye , Zhiyou Zhang
Weak measurement (WM) based on post-selection is a useful tool for precision metrology due to the ability of amplifying weak physical effects. In this paper, we reveal the underlying mechanism of the amplification in the post-selected WM based on the weak-value amplification (WVA) and the almost balanced weak-values amplification (ABWVA) strategies. We find that the amplification stems from the interference between the local oscillator and signal components which are respectively associated with the initial system state and the state disturbance induced by the weak coupling. The magnitude of the amplification is proportional to the interference strength which is dominated by the post-selection and the coupling strength. Furthermore, our theory can perfectly explain the amplification limit in the WVA strategy and the anomalous amplification in the ABWVA strategy.
中文翻译:
后选弱测量中基于干扰的弱值放大效应
由于具有放大弱物理效应的能力,基于后选择的弱测量 (WM) 是精密计量的有用工具。在本文中,我们基于弱值放大(WVA)和几乎平衡的弱值放大(ABWVA)策略揭示了后选WM中放大的潜在机制。我们发现放大源于本地振荡器和分别与初始系统状态和弱耦合引起的状态扰动相关的信号分量之间的干扰。放大的幅度与干扰强度成正比,干扰强度由后选择和耦合强度决定。此外,