Quantum-enhanced optical phase-insensitive heterodyne detection beyond 3-dB noise penalty of image band
Abstract
Optical phase-insensitive heterodyne (beat-note) detection, which measures the relative phase of two beams at different frequencies through their interference, is a key sensing technology for various spatial/temporal measurements, such as frequency measurements in optical frequency combs. However, its sensitivity is limited not only by shot noise from the signal frequency band but also by the extra shot noise from an image band, known as the 3-dB noise penalty. Here, we propose a method to remove shot noise from all these bands using squeezed light. We also demonstrate beyond-3-dB noise reduction experimentally, confirming that our method actually reduces shot noise from both the signal and extra bands simultaneously. Our work should boost the sensitivity of various spatial/temporal measurements beyond the current limitations.
Keywords
Cite
@article{arxiv.2305.06579,
title = {Quantum-enhanced optical phase-insensitive heterodyne detection beyond 3-dB noise penalty of image band},
author = {Keitaro Anai and Yutaro Enomoto and Hiroto Omura and Koji Nagano and Kiwamu Izumi and Mamoru Endo and Shuntaro Takeda},
journal= {arXiv preprint arXiv:2305.06579},
year = {2024}
}
Comments
16 pages and 8 figures for the main text