Optimal Measurement of Telecom Wavelength Single Photon Polarisation via Hong-Ou-Mandel Interferometry

Year: 2023

Authors: Sgobba Fabrizio; Pallotti Deborah Katia; Elefante Arianna; Dello Russo Stefano; Dequal Daniele; Siciliani de Cumis Mario; Amato Luigi Santamaria

Autors Affiliation: Italian Space Agency (ASI), Centro Spaziale ?Giuseppe Colombo?, Localita Terlecchia, 75100 Matera, Italy; Istituto Nazionale di Ottica, Consiglio Nazionale delle Ricerche, Largo E. Fermi 6, 50125 Firenze, Italy; Istituto Nazionale di Ottica, CNR-INO, Via Campi Flegrei n. 34, 80078 Pozzuoli, Italy

Abstract: The use of statistical estimation theory to boost the metrological performance of the measurement apparatus is becoming increasingly popular in a wide range of applications. Recently, such an approach has been adopted in Hong Ou Mandel interferometry, setting a new record in time delay and polarization measurement. Here, we extend these pioneering experiments in the telecom range to unlock the full potential of the information-based approach combined with a versatile spectral range, aiming for its adoption in fiber-coupled devices of up to hundreds of kilometers long as bobines or optical networks. Our measurement saturates the Cramer-Rao bound and in a long lasting experiment returns an Allan deviation of the polarization angle of 0.002 degs in 1 h of integration time.

Journal/Review: PHOTONICS

Volume: 10 (1)      Pages from: 72-1  to: 72-9

KeyWords: Hong Ou Mandel interferometry, polarization measurement, Cramer-Rao bound, Fisher Information
DOI: 10.3390/photonics10010072