Quantum-enhanced phase sensing via spectral noise reduction

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.

Quantum-enhanced sensing via spectral noise reduction
Romain Dalidet, Sébastien Tanzilli, Audrey Dot +4
HAL5 Oct 2026PreprintLicence not statedQuantum physics & quantum informationHAL
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BibTeX RIS

BibTeX

@article{dalidet2026quantumenhanced,
  title = {{Quantum-enhanced phase sensing via spectral noise reduction}},
  author = {Romain Dalidet and Anthony Martin and Audrey Dot and Inès Ghorbel and Loïc Morvan and Laurent Labonté and Sébastien Tanzilli},
  journal = {Physical Review Research},
  year = {2026},
  month = sep,
  doi = {10.1103/27hr-smgc},
  url = {https://hal.science/hal-05779808v1},
  note = {CC BY},
}

RIS

TY  - JOUR
TI  - Quantum-enhanced phase sensing via spectral noise reduction
AU  - Romain Dalidet
AU  - Anthony Martin
AU  - Audrey Dot
AU  - Inès Ghorbel
AU  - Loïc Morvan
AU  - Laurent Labonté
AU  - Sébastien Tanzilli
PY  - 2026
DA  - 2026/09/23
JO  - Physical Review Research
DO  - 10.1103/27hr-smgc
UR  - https://hal.science/hal-05779808v1
AB  - 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.
SN  - 2643-1564
SN  - 2643-1564
ER  -

Abstract

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