Simulation and demonstration of non-degenerate high purity biphoton state generation by SPDC in PPKTP

Hugo da Nóbrega; Giacomo Corrielli; Andrea Barone; Daniele Bajoni; Marco Liscidini; Matteo Galli; Roberto Osellame

doi:10.1117/12.3002457

13 March 2024 Simulation and demonstration of non-degenerate high purity biphoton state generation by SPDC in PPKTP

Hugo da Nóbrega, Giacomo Corrielli, Andrea Barone, Daniele Bajoni, Marco Liscidini, Matteo Galli, Roberto Osellame

Proceedings Volume 12911, Quantum Computing, Communication, and Simulation IV; 129110T (2024) https://doi.org/10.1117/12.3002457
Event: SPIE Quantum West, 2024, San Francisco, California, United States

Abstract

Single photons generated by spontaneous parametric down conversion are often utilized in heralded schemes, in which case the heralded photon purity must be maximized to preserve the indistinguishability of the photons that carry out quantum computing. In this work, we present software designed for accurate calculation of such purity, which was optimized to minimize computational resources and time, allowing for maximum purity searches in broad wavelength ranges. Lithium niobate and potassium titanyl phosphate (KTP) were studied in three phase-matching conditions, and an ultra-high purity configuration was found. The configuration was experimentally realized through an ion-exchanged KTP waveguide, exploiting flexibility in pump and phase matching temperature to compensate fabrication deviations, and purities as high as 0.923 were found, with very high generation rate of 40.7 MHz/mW. The experimental purity is significantly degraded by the multimode guiding at the desired wavelengths, which we propose to address by engineering with femtosecond laser writing, of which preliminary results are presented.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Hugo da Nóbrega, Giacomo Corrielli, Andrea Barone, Daniele Bajoni, Marco Liscidini, Matteo Galli, and Roberto Osellame "Simulation and demonstration of non-degenerate high purity biphoton state generation by SPDC in PPKTP", Proc. SPIE 12911, Quantum Computing, Communication, and Simulation IV, 129110T (13 March 2024); https://doi.org/10.1117/12.3002457

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