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Frontiers in Optics

Polarization-Entangled Visible-Telecom Photon Pair Generation using SiN Waveguides

Vijay Vijay, Joyee Ghosh, Vivek Venkataraman

Published Jan 1, 2024• 0 citations
Publisher

Abstract

We propose an integrated source of polarization-entangled visible-telecom photon pairs (~520-1509 nm) via SFWM in SiN waveguides, with a maximum concurrence of ~0.98. Such sources could be used for quantum communication, sensing, computing, and networking.
DOI
10.1364/fio.2024.jw4a.56

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We report the realization of a new polarization entangled photon-pair source based on a titanium-indiffused waveguide integrated on periodically poled lithium niobate pumped by a CW laser at 655 nm. The paired photons are emitted at the telecom wavelength of 1310 nm within a bandwidth of 0.7 nm. The quantum properties of the pairs are measured using a two-photon coalescence experiment showing a visibility of 85%. The evaluated source brightness, on the order of 10(5) pairs s(-1)GHz(-1)mW(-1), associated with its compactness and reliability, demonstrates the source's high potential for long-distance quantum communication.