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Conference on Lasers and Electro-Optics

High visibility time-energy entangled photons from a silicon microdisk resonator

Steven D. Rogers, Daniel Mulkey, Xiyuan Lu, Wei C. Jiang, Qiang Lin

Published Jan 1, 2016• 1 citation
Publisher

Abstract

We report the highest raw quantum interference visibility for time-energy entangled photon pairs from a micron scale source, to date. Bi-photons from a silicon microdisk resonator were observed to have a raw coincidence visibility of (96.6 ± 1.1)%.
DOI
10.1364/cleo_qels.2016.fm2n.3

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An integrated source of time-energy entangled photons is demonstrated through resonantly enhanced spontaneous four-wave mixing in a silicon micro-ring resonator. A Franson type set-up is employed to show the quantum interference between photon pairs with a visibility exceeding 90% and a violation of the Bell's inequality by more than 10 standard deviations. The high spectral brightness and the extremely small footprint of our source make it suitable for the development of quantum information protocols integrated on chip.
Time-energy entangled photon pairs are fundamental resources for quantum communication protocols since they are robust against environmental fluctuations in optical fiber networks. Pair sources based on spontaneous four-wave mixing in silicon microring resonators usually employ expensive external tunable lasers to compensate for ambient fluctuations; adopting self-pumped configurations, instead, lifts the need for such external source. Here we demonstrate the emission of time-energy entangled photon pairs at telecom wavelengths from a silicon self-pumped ring, obtaining a Franson interference fringe with 93.9 % ± 0.9 % visibility.