Integrated frequency comb source of heralded single photons

Reimer, Christian and Caspani, Lucia and Clerici, Matteo and Ferrera, Marcello and Kues, Michael and Peccianti, Marco and Pasquazi, Alessia and Razzari, Luca and Little, Brent E. and Chu, Sai T. and Moss, David J. and Morandotti, Roberto (2014) Integrated frequency comb source of heralded single photons. Optics Express, 22 (6). pp. 6535-6546. ISSN 1094-4087 (

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We report an integrated photon pair source based on a CMOS-compatible microring resonator that generates multiple, simultaneous, and independent photon pairs at different wavelengths in a frequency comb compatible with fiber communication wavelength division multiplexing channels (200 GHz channel separation) and with a linewidth that is compatible with quantum memories (110 MHz). It operates in a self-locked pump configuration, avoiding the need for active stabilization, making it extremely robust even at very low power levels.