We report an efficient energy-time entangled photon-pair source based on four-wave mixing in a CMOS-compatible silicon photonics ring resonator. Thanks to suitable optimization, the source shows a large spectral brightness of 400\,pairs of entangled photons /s/MHz for 500μW pump power. Additionally, the resonator has been engineered so as to generate a frequency comb structure compatible with standard telecom dense wavelength division multiplexers. We demonstrate high-purity energy-time entanglement, i.e., free of photonic noise, with near perfect raw visibilities (>~98\%) between various channel pairs in the telecom C-band. Such a compact source stands as a path towards more complex quantum photonic circuits dedicated to quantum communication systems.
@article{arxiv.1609.00521,
title = {High-quality photonic entanglement for wavelength-multiplexed quantum communication based on a silicon chip},
author = {Florent Mazeas and Michele Traetta and Marco Bentivegna and Florian Kaiser and Djeylan Aktas and Weiwei Zhang and Carlos Alonso Ramos and Lutfi-Arif Bin-Ngah and Tommaso Lunghi and Éric Picholle and Nadia Belabas-Plougonven and Xavier Le Roux and Éric Cassan and Delphine Marris-Morini and Laurent Vivien and Grégory Sauder and Laurent Labonté and Sébastien Tanzilli},
journal= {arXiv preprint arXiv:1609.00521},
year = {2017}
}