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  • Open Access

Quantum-enhanced phase sensing via spectral noise reduction

Romain Dalidet1, Anthony Martin1, Audrey Dot2, Inès Ghorbel2, Loïc Morvan2, Laurent Labonté1,*, and Sébastien Tanzilli1

  • *Contact author: laurent.labonte@univ-cotedazur.fr
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Phys. Rev. Research 8, 033354 – Published 23 September, 2026

DOI: https://doi.org/10.1103/27hr-smgc

Abstract

We report a direct demonstration of quantum-enhanced sensing in the Fourier domain by comparing single- and two-photon interference in a fiber-based interferometer under strictly identical noise conditions. The simultaneous acquisition of both signals provides a common-mode reference that enables a fair and unambiguous benchmark of quantum advantage. Spectral analysis of the interferometric outputs reveals that quantum correlations do not increase the amplitude of the modulation peak, but instead lower the associated noise floor, resulting in the expected 3 dB improvement in signal-to-noise ratio. This enhancement persists in the sub-shot-noise regime, where the classical signal becomes indistinguishable from the spectral background while the two-photon contribution remains resolvable. These observations establish quantum supersensitivity in the Fourier domain as an operational and broadly applicable resource for precision interferometric sensing.

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Phys. Rev. Research 8, 033354– Published 23 September, 2026
  • Received 10 March 2026
  • Accepted 6 August 2026
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Published by the American Physical Society under the terms of the 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.

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