LIGO Document T1200008-v3

Comparison of Quantum Noise in 3G Interferometer Configurations

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T - Technical notes
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There are several configurations proposed in the gravitational-wave community for reducing the quantum noise in future advanced detectors. In this note, we make a systematic comparison among them by considering their sensitivities and complexities. We numerically optimize their sensitivities by introducing a cost function that tries to maximize the broadband improvement over the design sensitivity of advanced LIGO. We find that the frequency-dependent squeezed-light injection with a hundred-meter scale filter cavity shows nice broadband sensitivity and involves a minimal number of additional large optics. This study gives us a guideline for the near-term experimental researches in enhancing the performance of future advanced gravitational-wave detectors.
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3G quantum noise
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