Sensors, Vol. 24, Pages 2202: Photon Phase Delay Sensing with Sub-Attosecond Uncertainty

Sensors, Vol. 24, Pages 2202: Photon Phase Delay Sensing with Sub-Attosecond Uncertainty Sensors doi: 10.3390/s24072202 Authors: Fabrizio Sgobba Andrea Andrisani Luigi Santamaria Amato The application of statistical estimation theory to Hong–Ou–Mandel interferometry led to enticing results in terms of the detection limit for photon reciprocal delay and polarisation measurement. In the following paper, a fully fibre-coupled setup operating in the telecom wavelength region proves to achieve, for the first time, in common-path Hong–Ou–Mandel-based interferometry, a detection limit for photon phase delay at the zeptosecond scale. The experimental results are then framed in a theoretical model by calculating the Cramer–Rao bound (CRB) and, after comparison with the obtained experimental results, it is shown that our setup attains the optimal measurement, nearly saturating CRB.
Source: Sensors - Category: Biotechnology Authors: Tags: Article Source Type: research