天基光学原子钟探测引力波的一种低频优势方案
A protocol of potential advantage in the low frequency range to gravitational wave detection with space based optical atomic clocks
摘要：
最近的提议描述了利用光晶格原子钟的基于空间的引力波（GW）探测[Kolkowitz et.例如，D 94，124043（2016）] [1]。在此基础上，我们提出了一种利用光晶格原子钟探测低频引力波的新方法。在我们的方法中，收集n个连续的多普勒信号，并对所有这些信号进行求和，以提高低频GW检测的灵敏度。特别地，该改进可通过多普勒信号的数量来调节，这相当于增加了两个原子钟之间的长度。因此，可以达到相同的灵敏度，但是具有更短的距离，即使加速噪声导致在由量子投影噪声确定的频率的拐点以下未能实现预期的改善。我们的研究结果是及时的正在进行的发展空间出生的天文台，旨在研究与低频GW的物理和天体物理效应。
英文摘要：
A recent proposal describes space based gravitational wave (GW) detection with optical lattice atomic clocks [Kolkowitz et. al., Phys. Rev. D 94, 124043 (2016)] [1]. Based on their setup, we propose a new measurement method for gravitational wave detection in low frequency with optical lattice atomic clocks. In our method, n successive Doppler signals are collected and the summation for all these signals is made to improve the sensitivity of the low-frequency GW detection. In particular, the improvement is adjustable by the number of Doppler signals, which is equivalent to that the length between two atomic clocks is increased. Thus, the same sensitivity can be reached but with shorter distance, even though the acceleration noises lead to failing to achieve the anticipated improvement below the inflection point of frequency which is determined by the quantum projection noise. Our result is timely for the ongoing development of space-born observatories aimed at studying physical and astrophysical effects associated with low-frequency GW.
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