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Dipartimento di Farmacia, Università di Salerno, I-84084 Fisciano, Salerno, Italy.
INFN, Sezione di Napoli, I-80126 Napoli, Italy.
Phys Rev Lett. 2023 Jul 28;131(4):041403. doi: 10.1103/PhysRevLett.131.041403.
In this Letter, we present the design and performance of the frequency-dependent squeezed vacuum source that will be used for the broadband quantum noise reduction of the Advanced Virgo Plus gravitational-wave detector in the upcoming observation run. The frequency-dependent squeezed field is generated by a phase rotation of a frequency-independent squeezed state through a 285 m long, high-finesse, near-detuned optical resonator. With about 8.5 dB of generated squeezing, up to 5.6 dB of quantum noise suppression has been measured at high frequency while close to the filter cavity resonance frequency, the intracavity losses limit this value to about 2 dB. Frequency-dependent squeezing is produced with a rotation frequency stability of about 6 Hz rms, which is maintained over the long term. The achieved results fulfill the frequency dependent squeezed vacuum source requirements for Advanced Virgo Plus. With the current squeezing source, considering also the estimated squeezing degradation induced by the interferometer, we expect a reduction of the quantum shot noise and radiation pressure noise of up to 4.5 dB and 2 dB, respectively.
在本信函中,我们展示了即将用于高级处女座升级版引力波探测器在即将到来的观测运行中进行宽带量子噪声降低的频率相关压缩真空源的设计与性能。频率相关压缩场是通过一个频率无关的压缩态在一个285米长、高精细度、近失谐光学谐振腔内的相位旋转产生的。产生了约8.5分贝的压缩,在高频处测量到高达5.6分贝的量子噪声抑制,而在接近滤波器腔共振频率时,腔内损耗将该值限制在约2分贝。频率相关压缩以约6赫兹均方根值的旋转频率稳定性产生,并能长期保持。所取得的结果满足了高级处女座升级版对频率相关压缩真空源的要求。使用当前的压缩源,同时考虑到干涉仪引起的估计压缩退化,我们预计量子散粒噪声和辐射压力噪声分别最多降低4.5分贝和2分贝。