Quantum-Enhanced Absorption Spectroscopy with Bright Squeezed Frequency Combs

Alex D M G Belsley*

*Corresponding author for this work

Research output: Contribution to journalLetter (Academic Journal)peer-review

8 Citations (Scopus)

Abstract

Absorption spectroscopy is a widely used technique that permits the detection and characterization of gas species at low concentrations. We propose a sensing strategy combining the advantages of frequency modulation spectroscopy with the reduced noise properties accessible by squeezing the probe state. A homodyne detection scheme allows the simultaneous measurement of the absorption at multiple frequencies and is robust against dispersion across the absorption profile. We predict a significant enhancement of the signal-to-noise ratio that scales exponentially with the squeezing factor. An order of magnitude improvement beyond the standard quantum limit is possible with state-of-the-art squeezing levels facilitating high precision gas sensing.
Original languageEnglish
Article number133602
Number of pages6
JournalPhysical Review Letters
Volume130
Issue number13
DOIs
Publication statusPublished - 28 Mar 2023

Bibliographical note

Funding Information:
A. B. acknowledges support from the European Research Council starting Grant ERC-2018-STG 803665 and the Engineering and Physical Sciences Research Council Grant EP/S023607/1. All the data needed to evaluate the conclusions of this Letter are present in the main text and in the Supplemental Material.

Publisher Copyright:
© 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Keywords

  • Quantum Metrology
  • Quantum Optics
  • Quantum Sensing
  • Photonics
  • Integrated Optics
  • Squeezed Light
  • Optical spectroscopy
  • Spectroscopy
  • Quantum Information
  • Parameter Estimation

Fingerprint

Dive into the research topics of 'Quantum-Enhanced Absorption Spectroscopy with Bright Squeezed Frequency Combs'. Together they form a unique fingerprint.

Cite this