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首页> 外文会议>2017 Conference on Lasers and Electro-Optics Europe amp; European Quantum Electronics Conference >Quantum nondemolition measurement of light intensity fluctuations in an optomechanical experiment
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Quantum nondemolition measurement of light intensity fluctuations in an optomechanical experiment

机译：光学机械实验中光强度波动的量子非爆破测量

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Summary form only given. According to quantum mechanics, there exists a class of observables for which is possible to confine the perturbation produced by a continuous measurement to the conjugate variable. Therefore, it is possible to devise experimental schemes that allow estimating the observed variable with arbitrary accuracy, or preparing it in a well-known state. Such schemes are referred to as quantum non-demolition measurements (QND). Among these observables there is the amplitude of the light field. Indeed, it is possible to exploit a movable mirror to implement a QND scheme [1]. Intensity fluctuations of an optical field impinging on it are not affected by the interaction. However, the movable mirror is excited by the associated radiation pressure. This, in turn, affects the phase of the field.We have performed an optomechanical experiment, based on a Fabry-Pérot cavity in which the end mirror is a high Q micro-mechanical device [2], where we have simultaneously measured intensity fluctuations of the field reflected by the cavity and the mirror motion imprinted in the phase fluctuations. By exploiting the correlations between these variables, we demonstrate a reduced uncertainty on intensity fluctuations actually achieving a sub-shot noise level.
机译：仅提供摘要表格。根据量子力学，存在一类可观的观测值，可以将通过连续测量产生的扰动限制在共轭变量上。因此，可以设计实验方案，以允许以任意精度估计观察到的变量，或以众所周知的状态准备它。这种方案被称为量子非爆破测量（QND）。在这些可观察的结果中，存在光场的振幅。确实，有可能利用可移动镜来实现QND方案[1]。撞击在其上的光场的强度波动不受相互作用的影响。然而，可移动镜被相关联的辐射压力激发。反过来，这会影响磁场的相位。我们基于法布里-珀罗腔进行了光机械实验，其中端镜是高Q微机械装置[2]，我们同时测量了强度波动由腔体反射的场和反射镜运动记录在相位波动中。通过利用这些变量之间的相关性，我们证明了强度波动的不确定性降低了，实际上达到了子弹噪声级。

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