Work

Sum-frequency-based photon-number-resolving detector for telecom wavelengths

Year: 2025

Type: article

Abstract: The use of C-band wavelengths in the field of quantum communication has grown significantly, driving the need for versatile detection solutions, especially in the low intensity domain. Among the desirable features for such detectors, photon-number-resolving (PNR) capability is particularly valuable, since it can offer new possibilities for enhancing security of communication protocols. In this paper, we present the implementation of a receiver that combines low-cost PNR detectors with nonlinear optical interactions to achieve sensitivity at telecom wavelengths. In particular, we use this receiver to characterize the Poissonian nature of a femtosecond source at 1.5 μm, produced via white light continuum generation followed by a single-stage amplification process. The obtained results encourage the exploitation of such a detector in more complex schemes.

Source: APL Photonics

DOI: 10.1063/5.0292182

Authors: S. Cassina, A. Pozzoli, G. Vesco, M. Lamperti, M. Marangoni, A. Allevi

Institutions: University of Insubria, Politecnico di Milano

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,750

Funder: Ministero dell'Università e della Ricerca