Ghost imaging as loss estimation: Quantum versus classical schemes

Year: 2022

Authors: Chiuri A., Gianani I., Cimini V., De Dominicis L., Genoni M.G., Barbieri M.

Autors Affiliation: ENEA, Centro Ricerche Frascati, via E. Fermi 45, 00044 Frascati, Italy; Dipartimento di Scienze, Universitb degli Studi Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy; Dipartimento di Fisica, Sapienza Universita di Roma, Piazzale Aldo Moro 5, I-00185 Roma, Italy; Dipartimento di Fisica “Aldo Pontremoli”, Universita degli Studi di Milano, 20133 Milan, Italy; Istituto Nazionale di Ottica (INO-CNR), L.go E. Fermi 6, I-50125 Firenze, Italy

Abstract: Frequency correlations are a versatile and powerful tool which can be exploited to perform spectral analysis of objects whose direct measurement might be unfeasible. This is achieved through a so-called ghost spectrometer that can be implemented with quantum and classical resources alike. While there are some known advantages associated to either choice, an analysis of their metrological capabilities has not yet been performed. Here we report on the metrological comparison between a quantum and a classical ghost spectrometer. We perform the estimation of the transmittivity of a bandpass filter using frequency-entangled photon pairs. Our results show that a quantum advantage is achievable, depending on the values of the transmittivity and on the number of frequency modes analyzed.


Volume: 105 (1)      Pages from: 013506-1  to: 013506-6

More Information: The authors thank M. Guarneri for assistance with the numerical calculations, G. Satta for assistance in the laboratory, and V. Berardi for fruitful discussion. This work was supported by the European Commission (FET-OPENRIA STORMYTUNE, Grant Agreement No. 899587), and by the NATO SPS Project HADES – MYP G5839. M.G.G. acknowledges support from a Rita Levi Montalcini fellowship of MIUR.
KeyWords: NOISE
DOI: 10.1103/PhysRevA.105.013506