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arXiv 1608.00699quant-phcond-mat.mes-hallphysics.optics
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用于力计量的室温机械振荡器产生的光的量子关联

Quantum correlations of light due to a room temperature mechanical oscillator for force metrology

Vivishek Sudhir, Ryan Schilling, Sergey A. Fedorov, Hendrik Schuetz, Dalziel J. Wilson, Tobias J. Kippenberg

摘要:

通过辐射压力将激光耦合到机械振荡器导致激光束的振幅和相位正交之间的量子力学相关性的出现。这些关联形成了一个通用的非经典资源,可用于量子增强力计量学,并在强关联的限制下产生有质动力压缩。迄今为止,这种资源只在少数低温腔光学机械实验中观察到。在这里,我们证明了能够有效地解决印在与室温纳米机械振荡器相互作用的光学激光场的光机械量子相关性。在失谐零差探测器中,在远离振荡器谐振频率的频率下直接测量光场(“变分测量”),揭示了百分之几水平上的量子相关性。我们演示了如何的绝对可见性,这些相关性可用于量子增强估计的量子反作用力作用于振荡器,并提供了一个增强的相对信噪比的估计的非共振外力,即使在室温下。

英文摘要:

The coupling of laser light to a mechanical oscillator via radiation pressure leads to the emergence of quantum mechanical correlations between the amplitude and phase quadrature of the laser beam. These correlations form a generic non-classical resource which can be employed for quantum-enhanced force metrology, and give rise to ponderomotive squeezing in the limit of strong correlations. To date, this resource has only been observed in a handful of cryogenic cavity optomechanical experiments. Here, we demonstrate the ability to efficiently resolve optomechanical quantum correlations imprinted on an optical laser field interacting with a room temperature nanomechanical oscillator. Direct measurement of the optical field in a detuned homodyne detector ("variational measurement") at frequencies far from the resonance frequency of the oscillator reveal quantum correlations at the few percent level. We demonstrate how the absolute visibility of these correlations can be used for a quantum-enhanced estimation of the quantum back-action force acting on the oscillator, and provides for an enhancement in the relative signal-to-noise ratio for the estimation of an off-resonant external force, even at room temperature.

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