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Quantum 2.0 Conference and Exhibition

Study of spectral decorrelation in photon pair generation using thin film lithium niobate

Muskan Muskan, C J Kiruthik Pranav, Jasleen Lugani

Published Jan 1, 2023• 0 citations
Publisher

Abstract

We demonstrate telecom-wavelength spectrally decorrelated photon pair generation using group index engineering in thin film lithium niobate. Simulations were performed to obtain a customized waveguide geometry to achieve high spectral purity of the photons.
DOI
10.1364/quantum.2023.qth2a.6

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In this work, we focus on optimizing waveguides based on Lithium Niobate on Insulator (LNOI) for the generation of cross-polarized spectrally pure photons at telecommunication wavelength using type II spontaneous Parametric Down-Conversion (SPDC) process. Our optimization process is based on avoiding lateral leakage losses for all the modes involved in considered SPDC process by choosing waveguide parameters appropriately. In addition, we also ensure single mode operation for all the interacting wavelengths. We further engineer the waveguide such that it satisfies group index matching for generating spectrally pure single photons with high purity (⪆95 %). Such single-mode and loss-free waveguides are poised to have broad applications in both classical and quantum optical fields.