On-chip quantum interference between silicon photon-pair sources

Silverstone, J.W. et al. (2014) On-chip quantum interference between silicon photon-pair sources. Nature Photonics, 8(2), pp. 104-108. (doi:10.1038/nphoton.2013.339)

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Abstract

Large-scale integrated quantum photonic technologies1, 2 will require on-chip integration of identical photon sources with reconfigurable waveguide circuits. Relatively complex quantum circuits have been demonstrated already1, 2, 3, 4, 5, 6, 7, but few studies acknowledge the pressing need to integrate photon sources and waveguide circuits together on-chip8, 9. A key step towards such large-scale quantum technologies is the integration of just two individual photon sources within a waveguide circuit, and the demonstration of high-visibility quantum interference between them. Here, we report a silicon-on-insulator device that combines two four-wave mixing sources in an interferometer with a reconfigurable phase shifter. We configured the device to create and manipulate two-colour (non-degenerate) or same-colour (degenerate) path-entangled or path-unentangled photon pairs. We observed up to 100.0 ± 0.4% visibility quantum interference on-chip, and up to 95 ± 4% off-chip. Our device removes the need for external photon sources, provides a path to increasing the complexity of quantum photonic circuits and is a first step towards fully integrated quantum technologies.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Tanner, Dr Michael and Hadfield, Professor Robert
Authors: Silverstone, J.W., Bonneau, D., Ohira, K., Suzuki, N., Yoshida, H., Iizuka, N., Ezaki, M., Natarajan, C.M., Tanner, M.G., Hadfield, R.H., Zwiller, V., Marshall, G.D., Rarity, J.G., O'Brien, J.L., and Thompson, M.G.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Nature Photonics
Publisher:Nature Publishing Group
ISSN:1749-4885
ISSN (Online):1749-4893
Copyright Holders:Copyright © 2014 Macmillan Publishers Limited
First Published:First published in Nature Photonics 8(2):104-108
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
622331Lithium niobate integrated quantum photonicsRobert HadfieldEngineering & Physical Sciences Research Council (EPSRC)EP/I036273/1ENG - ENGINEERING ELECTRONICS & NANO ENG