Proposal for gravitational-wave detection beyond the standard quantum limit through EPR entanglement
Proposal for gravitational-wave detection beyond the standard quantum limit through EPR entanglement
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DOI：
10.1038/nphys4118
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发表时间：
2017-08-01
期刊：
影响因子：
19.6
通讯作者：
Chen, Yanbei
中科院分区：
文献类型：
--
作者：
Ma, Yiqiu;Miao, Haixing;Chen, Yanbei
在连续监测系统中，标准量子极限由散粒噪声和反作用噪声之间的权衡给出。在先进的LIGO等引力波探测器中，这两种贡献可以通过注入具有频率依赖性压缩角的压缩真空态的频谱在宽频带内同时压缩。这种方法需要在探测器所在地的真空系统中设置一个额外的长基线、低损耗滤波器腔。在这里，我们表明，需要这样的滤波腔可以消除，利用爱因斯坦-波多尔斯基-罗森（EPR）纠缠信号和空闲光束。通过利用它们的相互量子相关性和每个光束在干涉仪中传播方式的差异，一旦检测到输出闲频光束，我们可以设计输入信号光束具有适当的频率相关条件压缩。我们的建议是适当的所有未来的引力波探测器实现超出标准量子极限的灵敏度。
In continuously monitored systems the standard quantum limit is given by the trade-off between shot noise and back-action noise. In gravitational-wave detectors, such as Advanced LIGO, both contributions can be simultaneously squeezed in a broad frequency band by injecting a spectrum of squeezed vacuum states with a frequency-dependent squeeze angle. This approach requires setting up an additional long baseline, low-loss filter cavity in a vacuum system at the detector's site. Here, we show that the need for such a filter cavity can be eliminated, by exploiting Einstein-Podolsky-Rosen (EPR)-entangled signals and idler beams. By harnessing their mutual quantum correlations and the difference in the way each beam propagates in the interferometer, we can engineer the input signal beam to have the appropriate frequency-dependent conditional squeezing once the out-going idler beam is detected. Our proposal is appropriate for all future gravitational-wave detectors for achieving sensitivities beyond the standard quantum limit.