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Pure narrowband photon-pair generation in a monolithic cavity
Xavier Barcons Planas, Helen M. Chrzanowski, Janik Wolters·February 4, 2026
Quantum Physics
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Abstract
Photonic quantum technologies require efficient sources of pure single photons. Here we present a heralded SPDC single-photon source in a monolithic cavity optimized for high spectral and spatial purity. The source heralds single-photons at a wavelength of 1540 nm and a spectral bandwidth of 168 MHz with a maximum heralding efficiency of 84%, while keeping the multi-photon contamination below 3%. The cavity enhancement generates photons mainly in the central cavity mode with 96.2% spectral purity.