Unidirectional frequency conversion in microring resonators for on-chip frequency-multiplexed single-photon sources

Microring resonators are attractive for low-power frequency conversion via Bragg-scattering four-wave-mixing due to their comb-like resonance spectrum, which allows resonant enhancement of all four waves while maintaining energy and momentum conservation. However, the symmetry of such mode structure...

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Bibliographic Details
Published in:New journal of physics 2019-03, Vol.21 (3), p.33037
Main Authors: Heuck, Mikkel, Koefoed, Jacob Gade, Christensen, Jesper Bjerge, Ding, Yunhong, Frandsen, Lars Hagedorn, Rottwitt, Karsten, Oxenløwe, Leif Katsuo
Format: Article
Language:English
Subjects:
Conversion
Emission analysis
Energy conservation
Four-wave mixing
frequency conversion
Multiplexing
Numerical analysis
Photon emission
Photons
Physics
Q factors
quantum information technology
Resonance scattering
Resonators
single photon source
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Summary:Microring resonators are attractive for low-power frequency conversion via Bragg-scattering four-wave-mixing due to their comb-like resonance spectrum, which allows resonant enhancement of all four waves while maintaining energy and momentum conservation. However, the symmetry of such mode structures limits the conversion efficiency to 50% due to the equal probability of up- and down-conversion. Here, we demonstrate how two coupled microrings enable highly directional conversion between the spectral modes of one of the rings. An extinction between up- and down-conversion of more than 40 dB is experimentally observed. Based on this method, we propose a design for on-chip multiplexed single-photon sources that probabilistically generate photon pairs across many frequency modes of a ring resonator and subsequently convert them to a single frequency-thereby enabling quasi-deterministic photon emission. Our numerical analysis shows that once a photon is generated, it can be converted and emitted into a wave packet having a 90% overlap with a Gaussian with 99% efficiency for a ratio between intrinsic and coupling quality factors of 400.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/ab09a7