Optimal detuning for quantum filter cavities
arXiv:2008.08086 · doi:10.1103/PhysRevD.102.102002
Abstract
Vacuum quantum fluctuations impose a fundamental limit on the sensitivity of gravitational-wave interferometers, which rank among the most sensitive precision measurement devices ever built. The injection of conventional squeezed vacuum reduces quantum noise in one quadrature at the expense of increasing noise in the other. While this approach improved the sensitivity of the Advanced LIGO and Advanced Virgo interferometers during their third observing run (O3), future improvements in arm power and squeezing levels will bring radiation pressure noise to the forefront. Installation of a filter cavity for frequency-dependent squeezing provides broadband reduction of quantum noise through the mitigation of this radiation pressure noise, and it is the baseline approach planned for all of the future gravitational-wave detectors currently conceived. The design and operation of a filter cavity requires careful consideration of interferometer optomechanics as well as squeezing degradation processes. In this paper, we perform an in-depth analysis to determine the optimal operating point of a filter cavity. We use our model alongside numerical tools to study the implications for filter cavities to be installed in the upcoming "A+" upgrade of the Advanced LIGO detectors.
9 pages, 7 figures
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Cited by in corpus (8)
- Advanced LIGO detector performance in the fourth observing run
- Squeezing the quantum noise of a gravitational-wave detector below the standard quantum limit
- Review of the Advanced LIGO gravitational wave observatories leading to observing run four
- LIGOs Quantum Response to Squeezed States
- Demonstration of an amplitude filter cavity at gravitational-wave frequencies
- Improving the stability of frequency dependent squeezing with bichromatic control of filter cavity length, alignment and incident beam pointing
- Performance of multiple filter-cavity schemes for frequency-dependent squeezing in gravitational-wave detectors
- Probing squeezing for gravitational-wave detectors with an audio-band field