A gigahertz source of polarisation entangled photons enabled by type-0 PPLN waveguides

Bienvenu I. Ndagano; Krish Pandiyan; Lewis Wright; Ruaridh Smith; Ali Anwar; Andy Astill; Corin B. E. Gawith; Loyd McKnight

doi:10.1117/12.3002484

13 March 2024 A gigahertz source of polarisation entangled photons enabled by type-0 PPLN waveguides

Bienvenu I. Ndagano, Krish Pandiyan, Lewis Wright, Ruaridh Smith, Ali Anwar, Andy Astill, Corin B. E. Gawith, Loyd McKnight

Author Affiliations +

Proceedings Volume PC12911, Quantum Computing, Communication, and Simulation IV; PC129110W (2024) https://doi.org/10.1117/12.3002484
Event: SPIE Quantum West, 2024, San Francisco, California, United States

Abstract

We demonstrate a source of polarisation-entangled photons that produces pairs of entangled photons at a rate of 1.25 gigahertz. Our system is enabled by Periodically Poled Lithium Niobate waveguides that produce degenerate photon-pairs with a centre wavelength of 1560 nm and a 0.1 nm bandwidth. We measured the degree of entanglement and obtained a CHSH parameter of 2.73. From measurements of polarisation discrimination in a BB84 protocol with two mutually unbiased bases, we obtained a measurement fidelity of 98% and estimated the maximum secure key rate to be 0.633 gigabits per second.

Conference Presentation

Citation Download Citation

Bienvenu I. Ndagano, Krish Pandiyan, Lewis Wright, Ruaridh Smith, Ali Anwar, Andy Astill, Corin B. E. Gawith, and Loyd McKnight "A gigahertz source of polarisation entangled photons enabled by type-0 PPLN waveguides", Proc. SPIE PC12911, Quantum Computing, Communication, and Simulation IV, PC129110W (13 March 2024); https://doi.org/10.1117/12.3002484

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