National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.
Phys Rev Lett. 2016 Jan 8;116(1):013602. doi: 10.1103/PhysRevLett.116.013602. Epub 2016 Jan 6.
We measure the fundamental noise processes associated with a continuous linear position measurement of a micromechanical membrane incorporated in a microwave cavity optomechanical circuit. We observe the trade-off between the two fundamental sources of noise that enforce the standard quantum limit: the measurement imprecision and radiation pressure backaction from photon shot noise. We demonstrate that the quantum backaction of the measurement can overwhelm the intrinsic thermal motion by 24 dB, entering a new regime for cavity optomechanical systems.
我们测量了与微机械膜在微波腔光机械电路中的连续线性位置测量相关的基本噪声过程。我们观察了两种基本噪声源之间的权衡，这两种噪声源限制了标准量子极限：测量不精确和光子散粒噪声的辐射压力反作用。我们证明，测量的量子反作用可以超过 24dB 的固有热运动，进入腔光机械系统的一个新区域。
