Vacuum fluctuations and balanced homodyne detection through ideal
multi-mode photon number or power counting detectors
- URL: http://arxiv.org/abs/2101.11838v1
- Date: Thu, 28 Jan 2021 07:09:17 GMT
- Title: Vacuum fluctuations and balanced homodyne detection through ideal
multi-mode photon number or power counting detectors
- Authors: Kouji Nakamura
- Abstract summary: The balanced homodyne detection as a readout scheme of gravitational-wave detectors is carefully examined.
This specification is necessary to apply the quantum measurement theory to gravitational-wave detections.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: 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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