1. Zeptosecond-scale single-photon gyroscope
- Author
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Sgobba, Fabrizio, Triggiani, Danilo, Tamma, Vincenzo, De Natale, Paolo, Gagliardi, Gianluca, Avino, Saverio, and Amato, Luigi Santamaria
- Subjects
Quantum Physics - 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 $t=10^4$ s averaging. The detection scheme proves to be the most resource-efficient possible, saturating $>99.5\%$ of the Cram\'er-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., Comment: 10 pages, 7 figures
- Published
- 2024
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