Zeptosecond-scale single-photon gyroscope

Fabrizio Sgobba; Danilo Triggiani; Vincenzo Tamma; Paolo De Natale; Gianluca Gagliardi; Saverio Avino; Luigi Santamaria Amato

doi:10.1002/qute.202400166

Zeptosecond-scale single-photon gyroscope

Fabrizio Sgobba, Danilo Triggiani, Vincenzo Tamma, Paolo De Natale, Gianluca Gagliardi, Saverio Avino^*, Luigi Santamaria Amato^*

^*Corresponding author for this work

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Abstract

This work presents an all-fiber telecom-range optical gyroscope employing a spontaneous parametric down conversion crystal to produce ultra-low intensity thermal light by tracing-out one of the heralded photons. The prototype exhibits a detection limit on photon delay measurements of 249 zs over a 72 s averaging time and 26 zs in differential delay measurements at t = 10⁴s averaging. The detection scheme proves to be the most resource-efficient possible, saturating > 99.5 % of the Cramér–Rao bound. These results are groundbreaking in the context of low-photon regime quantum metrology, paving the way to novel experimental configurations to bridge quantum optics with special or general relativity.

Original language	English
Journal	Advanced Quantum Technologies
Early online date	8 Jul 2024
DOIs	https://doi.org/10.1002/qute.202400166
Publication status	Early online - 8 Jul 2024

Keywords

Cramér–Rao bound
fibre-optic gyroscope
single photon interferometry

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10.1002/qute.202400166

Zeptosecond-Scale Single-Photon GyroscopeFinal published version, 1.46 MBLicence: CC BY

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abstract = "This work presents an all-fiber telecom-range optical gyroscope employing a spontaneous parametric down conversion crystal to produce ultra-low intensity thermal light by tracing-out one of the heralded photons. The prototype exhibits a detection limit on photon delay measurements of 249 zs over a 72 s averaging time and 26 zs in differential delay measurements at t = 104 s averaging. The detection scheme proves to be the most resource-efficient possible, saturating > 99.5 % of the Cram{\'e}r–Rao bound. These results are groundbreaking in the context of low-photon regime quantum metrology, paving the way to novel experimental configurations to bridge quantum optics with special or general relativity.",

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AU - Triggiani, Danilo

AU - Tamma, Vincenzo

AU - De Natale, Paolo

AU - Gagliardi, Gianluca

AU - Avino, Saverio

AU - Santamaria Amato, Luigi

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AB - This work presents an all-fiber telecom-range optical gyroscope employing a spontaneous parametric down conversion crystal to produce ultra-low intensity thermal light by tracing-out one of the heralded photons. The prototype exhibits a detection limit on photon delay measurements of 249 zs over a 72 s averaging time and 26 zs in differential delay measurements at t = 104 s averaging. The detection scheme proves to be the most resource-efficient possible, saturating > 99.5 % of the Cramér–Rao bound. These results are groundbreaking in the context of low-photon regime quantum metrology, paving the way to novel experimental configurations to bridge quantum optics with special or general relativity.

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Zeptosecond-scale single-photon gyroscope

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