New Photodetection Method Using Unbalanced Sidebands for Squeezed Quantum Noise in Gravitational Wave Interferometer

TL;DR

This paper proposes a novel heterodyne detection method with unbalanced sidebands to achieve quantum-non-demolition measurement in gravitational wave detectors, offering broadband capabilities and potentially surpassing traditional homodyne detection.

Contribution

It introduces a new heterodyne detection scheme with unbalanced sidebands that mimics homodyne quantum-non-demolition effects and enables broadband readout in gravitational wave interferometers.

Findings

Heterodyne detection with unbalanced sidebands can realize quantum-non-demolition effects.

The scheme allows broadband quantum-non-demolition readout.

Potential for improved gravitational wave detection sensitivity.

Abstract

Homodyne detection is one of the ways to circumvent the standard quantum limit for a gravitational wave detector. In this paper it will be shown that the same quantum-non-demolition effect using homodyne detection can be realized by heterodyne detection with unbalanced RF sidebands. Furthermore, a broadband quantum-non-demolition readout scheme can also be realized by the unbalanced sideband detection.