Kavli Affiliate: Lee McCuller
| First 5 Authors: Kentaro Komori, Dhruva Ganapathy, Chris Whittle, Lee McCuller, Lisa Barsotti
| Summary:
Quantum vacuum fluctuations fundamentally limit the precision of optical
measurements, such as those in gravitational-wave detectors. Injection of
conventional squeezed vacuum can be used to reduce quantum noise in the readout
quadrature, but this reduction is at the cost of increasing noise in the
orthogonal quadrature. For detectors near the limits imposed by quantum
radiation pressure noise (QRPN), both quadratures impact the measurement, and
the benefits of conventional squeezing are limited. In this paper, we
demonstrate the use of a critically-coupled 16m optical cavity to diminish
anti-squeezing at frequencies below 90Hz where it exacerbates QRPN, while
preserving beneficial squeezing at higher frequencies. This is called an
amplitude filter cavity, and it is useful for avoiding degradation of detector
sensitivity at low frequencies. The attenuation from the cavity also provides
technical advantages such as mitigating backscatter.
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