Exposing gravitational waves below the quantum sensing limit
Exposing gravitational waves below the quantum sensing limit
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DOI：
10.1103/physrevd.106.063017
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发表时间：
2022-05
影响因子：
5
通讯作者：
Hang Yu;D. Martynov;R. Adhikari;Yanbei Chen
中科院分区：
文献类型：
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作者：
Hang Yu;D. Martynov;R. Adhikari;Yanbei Chen
地面引力波(GW)探测器的灵敏度受到几百赫兹及以上量子散粒噪声的限制。然而，人们可以使用Martynov等人提出的量子关联技术。[物理。版本A 95,043831(2017年)]，以去除散粒噪声的期望值，从而在交叉频谱中暴露潜在的经典信号，该交叉频谱是通过在GW干涉仪的反对称端口中将两个输出互相关而形成的。我们在这里探讨了利用量子关联探测天体物理GW信号的前景，并分析了其灵敏度。从概念上讲，这种技术类似于两个不同的GW检测器的相关，因为它利用了这样一个事实，即GW信号在两个输出中是相关的，但散粒噪声将是不相关的。量子关联也有其独特的优势，因为它只需要一个干涉仪就可以进行检测。因此，量子关联可以增加占空比，提高搜索ffi的效率，并使高度极化信号的检测成为可能。特别是，我们发现量子关联特别适用于探测具有短(<；1 S)和中(∼10−10 4 S)持续时间的双中子星合并后的残余物，并对未知脉冲星的连续发射设定上限。
The sensitivities of ground-based gravitational wave (GW) detectors are limited by quantum shot noise at a few hundred Hertz and above. Nonetheless, one can use a quantum-correlation technique proposed by Martynov, et al. [Phys. Rev. A 95, 043831 (2017)] to remove the expectation value of the shot noise, thereby exposing underlying classical signals in the cross spectrum formed by cross-correlating the two outputs in a GW interferometer’s anti-symmetric port. We explore here the prospects and analyze the sensitivity of using quantum correlation to detect astrophysical GW signals. Conceptually, this technique is similar to the correlation of two different GW detectors as it utilizes the fact that a GW signal will be correlated in the two outputs but the shot noise will be uncorrelated. Quantum correlation also has its unique advantages as it requires only a single interferometer to make a detection. Therefore, quantum correlation could increase the duty cycle, enhance the search efficiency, and enable the detection of highly polarized signals. In particular, we show that quantum correlation could be especially useful for detecting post-merger remnants of binary neutron stars with both short ( < 1 s) and intermediate ( ∼ 10 − 10 4 s) durations and setting upper limits on continuous emissions from unknown pulsars.