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Quantum 2.0 Conference and Exhibition

Compact, Portable, Fiber-Coupled Correlated Photon Pair Source with Enhanced Performance

Csaba Tamás Holló, Tamás Sarkadi, Máté Galambos, Bertalan Bodrog, Attila Barócsi, Pál Koppa, Gábor Erdei

Published Jan 1, 2022• 0 citations
Publisher

Abstract

Our recently published photon source has been enhanced in terms of robustness and spectral width. Thanks to a custom breadboard rigidity increased by 350%, due to 10nm spectral filtering the heralding ratio grew to 39%.
DOI
10.1364/quantum.2022.qtu2a.18

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A small, portable, high-flux correlated photon-pair source has been designed and constructed from simple opto-mechanical parts. Unique to this device is its straightforward alignment process, together with the direct coupling of signal and idler photons into polarization-maintaining single-mode optical fibers. Spontaneous parametric down-conversion is used to produce photon pairs in β-barium borate (BBO) at a center wavelength of 810 nm. Owing to the applied type-I phase-matching, coincident photons have identical polarization. The estimated fiber-coupling efficiency is 51%, the measured photon and coincidence flux are 636 and 130 kHz/mW, respectively, normalized to pump power (44 mW). The source has an extremely wide wavelength spectrum of 202-nm FWHM, measured at the fiber output, which limits the actual heralding ratio to 20%.
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