Vacuum fluctuations and balanced homodyne detection through ideal multi-mode photon number or power counting detectors
General Relativity and Quantum Cosmology
2021-01-29 v1 Quantum Physics
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.
Keywords
Cite
@article{arxiv.2101.11838,
title = {Vacuum fluctuations and balanced homodyne detection through ideal multi-mode photon number or power counting detectors},
author = {Kouji Nakamura},
journal= {arXiv preprint arXiv:2101.11838},
year = {2021}
}
Comments
7 pages, 1 figure