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Loss-Tolerant Detection of Squeezed States in the 2 μm Region
OzGrav, Centre for Gravitational Astrophysics, Research School of Physics and Research School of Astronomy and Astrophysics, Australian National University, Australian Capital Territory, Australia.ORCID iD: 0009-0005-7151-4839
OzGrav, Centre for Gravitational Astrophysics, Research School of Physics and Research School of Astronomy and Astrophysics, Australian National University, Australian Capital Territory, Australia.ORCID iD: 0000-0002-6540-6824
OzGrav, Centre for Gravitational Astrophysics, Research School of Physics and Research School of Astronomy and Astrophysics, Australian National University, Australian Capital Territory, Australia.ORCID iD: 0000-0002-7120-9026
OzGrav, Centre for Gravitational Astrophysics, Research School of Physics and Research School of Astronomy and Astrophysics, Australian National University, Australian Capital Territory, Australia.ORCID iD: 0000-0002-2915-4690
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2026 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 136, no 12, article id 123601Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2026. Vol. 136, no 12, article id 123601
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Atom and Molecular Physics and Optics Other Civil Engineering Telecommunications Astronomy, Astrophysics and Cosmology Other Physics Topics
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URN: urn:nbn:se:kth:diva-380047DOI: 10.1103/s61z-fcypISI: 001730417500002PubMedID: 41965044Scopus ID: 2-s2.0-105033749298OAI: oai:DiVA.org:kth-380047DiVA, id: diva2:2055397
Note

QC 20260424

Available from: 2026-04-24 Created: 2026-04-24 Last updated: 2026-04-24Bibliographically approved

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Adya, V. B.

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