Loss-Tolerant Detection of Squeezed States in the 2 μ m Region

Physical Review Letters 2026

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Authors: KH Kwan, T. McRae, Jiayi Qin, Daniel W. Gould, S. Chua, J. Junker, R. Iden, V. B. Adya, M. J. Yap, Bram J. J. Slagmolen, David E. McClelland, Robert L. Ward
DOI: 10.1103/s61z-fcyp
Cited by: 1
References: 38

Abstract

Squeezed states of light enable quantum-enhanced measurements but are limited by optical loss, particularly at 2 μm where photodiode efficiency is low. We report the first loss-tolerant, audio-band squeezed light detection at 1984 nm by using a phase-sensitive amplifier to amplify the squeezed vacuum prior to detection. This technique increases the effective detection efficiency from 74% to 95% and increases the observed squeezing from 4 to 8 dB, the highest level of squeezing observation reported at this wavelength. Additionally, the vacuum to dark-noise clearance increases, extending the effective measurement bandwidth toward lower frequencies. This approach is largely wavelength independent, extending high-fidelity quantum measurements to future gravitational-wave detectors and related quantum technologies.

Fields of Study & Subjects

Quantum Information and Cryptography Quantum optics and atomic interactions Chemical and Physical Properties of Materials

Publication details

Journal / source
Physical Review Letters
Publisher
American Physical Society (APS)
Volume
136
Issue
12
Pages
123601–123601
Publication date
17 February 2026
Language
EN