Bienvenu I. Ndagano,1 Krish Pandiyan,2 Lewis Wright,2 Ruaridh Smith,1 Ali Anwar,1 Andy Astill,2 Corin B. E. Gawithhttps://orcid.org/0000-0002-3502-3558,2 Loyd McKnight1
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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.
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Bienvenu I. Ndagano, Krish Pandiyan, Lewis Wright, Ruaridh Smith, Ali Anwar, Andy Astill, Corin B. E. Gawith, 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