Quantum Backaction Cancellation in the Audio Band
Quantum Backaction Cancellation in the Audio Band
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DOI：
10.1103/physrevx.10.031065
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发表时间：
2018-12
影响因子：
12.5
通讯作者：
J. Cripe;T. Cullen;Yanbei Chen;P. Heu;D. Follman;G. Cole;T. Corbitt
中科院分区：
文献类型：
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作者：
J. Cripe;T. Cullen;Yanbei Chen;P. Heu;D. Follman;G. Cole;T. Corbitt
本文报道了光机械腔中量子反作用噪声的消除。我们进行两个测量的位移的微谐振器，一个在反射的腔，和一个在传输的腔。我们表明，测量的振幅正交的光在光机械腔的传输允许我们取消1 kHz和50 kHz之间的反作用噪声，并获得更灵敏的测量的微谐振器的位置。为了确认反向作用被消除，我们测量了传输信号中的噪声作为循环功率的函数。通过将透射光分束到两个光电探测器上，并对两个信号进行互相关，我们消除了散粒噪声的影响，测量了无量子噪声的热噪声谱。消除这种频率范围内的反作用效应是一种重要的技术证明，该技术可用于减轻干涉引力波探测器（如Advanced LIGO）中的反作用效应。
We report on the cancellation of quantum back action noise in an optomechanical cavity. We perform two measurements of the displacement of the microresonator, one in reflection of the cavity, and one in transmission of the cavity. We show that measuring the amplitude quadrature of the light in transmission of the optomechanical cavity allows us to cancel the back action noise between 1 kHz and 50 kHz, and obtain a more sensitive measurement of the microresonator's position. To confirm that the back action is eliminated, we measure the noise in the transmission signal as a function of circulating power. By splitting the transmitted light onto two photodetectors and cross correlating the two signals, we remove the contributon from shot noise and measure a quantum noise free thermal noise spectrum. Eliminating the effects of back action in this frequency regime is an important demonstration of a technique that could be used to mitigate the effects of back action in interferometric gravitational wave detectors such as Advanced LIGO.