光机械系统中弱测量的放大效应

Amplification effect of weak measurement in optomechanical system

为了提高单光子作用的机械振子动量,建立一种基于马赫曾德干涉仪的光机械模型。利用弱测量方法研究机械振子的微弱动量变化,揭示一种新的有关放大的物理机制,给出满足该放大机制的光机械系统方案。结果表明,当机械振子初始为相干态时,它的微弱动量可以被放大,其最大放大值可达到基态的零点涨落。该研究说明了机械振子微弱动量通过弱测量可以被提高。

This paper proposes an optomechanical model based on Mach-Zehnder interferometer,which aims to improve the momentum of the mechanical oscillator due to single photon.The study involves using the weak measurement method to investigate the way the weak momentum of the mechanical oscillator changes,and uncovering a new physical mechanism related to amplification and providing an optomechanical system scheme that satisfies this amplification mechanism.The results show that in the presence of the mechanical oscillator initially in a coherent state,its weak momentum can be amplified,and its maximum amplification value can reach the zero-point fluctuation of the ground state,an indication that the weak momentum of the mechanical oscillator can be increased by weak measurement.