Quantum-enhanced phase interrogation of a fiber-optic strain sensor
Abstract
Fiber-optic sensors enable high-sensitivity measurements of various physical parameters. Here, we demonstrate a quantum-enhanced interrogation of an all-fiber-optic Fabry-Pèrot resonator, employing entangled two-photon interference to probe directly strain-induced optical phase shifts. The resonator is interrogated by a narrow-linewidth laser that is frequency-locked to its resonance mode, thereby exploiting the cavity’s inherent sensitivity to variations in the fiber length. To access the phase fluctuations transferred to the interrogation field due to external perturbations on the sensor, we implement an in-fiber Mach–Zehnder interferometer readout. This configuration allows the sensor to operate both with classical coherent light and with entangled photon pairs generated via spontaneous parametric down-conversion. Harnessing two-photon entangled states corresponding to an N = 2 N00N state, we experimentally demonstrate a reduction of the measurement noise below the standard quantum limit. These results provide clear evidence of the quantum advantage in enhancing fiber-optic sensors under practical constraints on optical power.
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BibTeX
@misc{dalidet2026quantumenhanced,
title = {{Quantum-enhanced phase interrogation of a fiber-optic strain sensor}},
author = {Romain Dalidet and Marialuisa Capezzuto and Hugo Degert and Davide d'Ambrosio and Saverio Avino and Anthony Martin and Sebastien Tanzilli and Laurent Labonte and Paolo de Natale and Gianluca Gagliardi},
howpublished = {HAL},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.19752},
eprint = {2610.19752},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05800594v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Quantum-enhanced phase interrogation of a fiber-optic strain sensor
AU - Romain Dalidet
AU - Marialuisa Capezzuto
AU - Hugo Degert
AU - Davide d'Ambrosio
AU - Saverio Avino
AU - Anthony Martin
AU - Sebastien Tanzilli
AU - Laurent Labonte
AU - Paolo de Natale
AU - Gianluca Gagliardi
PY - 2026
DA - 2026/10/14
PB - HAL
DO - 10.48550/arxiv.2610.19752
UR - https://hal.science/hal-05800594v1
AB - Fiber-optic sensors enable high-sensitivity measurements of various physical parameters. Here, we demonstrate a quantum-enhanced interrogation of an all-fiber-optic Fabry-Pèrot resonator, employing entangled two-photon interference to probe directly strain-induced optical phase shifts. The resonator is interrogated by a narrow-linewidth laser that is frequency-locked to its resonance mode, thereby exploiting the cavity’s inherent sensitivity to variations in the fiber length. To access the phase fluctuations transferred to the interrogation field due to external perturbations on the sensor, we implement an in-fiber Mach–Zehnder interferometer readout. This configuration allows the sensor to operate both with classical coherent light and with entangled photon pairs generated via spontaneous parametric down-conversion. Harnessing two-photon entangled states corresponding to an N = 2 N00N state, we experimentally demonstrate a reduction of the measurement noise below the standard quantum limit. These results provide clear evidence of the quantum advantage in enhancing fiber-optic sensors under practical constraints on optical power.
ER -