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Unification of thermal and quantum noise in gravitational-wave detectors

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arxiv 2301.00338 v1 pith:MEPD6F6X submitted 2023-01-01 astro-ph.IM gr-qcquant-ph

Unification of thermal and quantum noise in gravitational-wave detectors

classification astro-ph.IM gr-qcquant-ph
keywords noisethermalopticalquantumdetectorsfieldgravitational-wavemass
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Contemporary gravitational-wave detectors are fundamentally limited by thermal noise -- due to dissipation in the mechanical elements of the test mass -- and quantum noise -- from the vacuum fluctuations of the optical field used to probe the test mass position. Two other fundamental noises can in principle also limit sensitivity: test-mass quantization noise due to the zero-point fluctuation of its mechanical modes, and thermal excitation of the optical field. We use the quantum fluctuation-dissipation theorem to unify all four noises. This unified picture shows precisely when test-mass quantization noise and optical thermal noise can be ignored.

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