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Vacuum fluctuations and balanced homodyne detection through ideal multi-mode photon number or power counting detectors

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arxiv 2101.11838 v1 pith:FV7JYTIJ submitted 2021-01-28 gr-qc quant-ph

classification gr-qcquant-ph
keywords detectionfluctuationsvacuumbalanceddensitydetectorsdirectlyformulation
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The balanced homodyne detection as a readout scheme of gravitational-wave detectors is carefully examined, which specifies the directly measured quantum operator in the detection. This specification is necessary to apply the quantum measurement theory to gravitational-wave detections. We clarify the contribution of vacuum fluctuations to the noise spectral density without using the two-photon formulation. We found that the noise spectral density in the two-photon formulation includes vacuum fluctuations from the main interferometer but does not includes those from the local oscillator which depends on the directly measured operators.

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Cited by 1 Pith paper

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