Abstract:
This paper 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.
Authors: Fabrizio Sgobba, Danilo Triggiani, Vincenzo Tamma, Paolo De Natale, Gianluca Gagliardi, Saverio Avino, Luigi Santamaria Amato
Publication location: Advanced Quantum Technologies
Date of publication: 15 July 2024
D.O.I: https://doi.org/10.48550/arXiv.2402.15385
