Imaging and certifying high-dimensional entanglement with a single-photon avalanche diode camera

Ndagano, B. , Defienne, H. , Lyons, A. , Starshynov, I. , Villa, F., Tisa, S. and Faccio, D. (2020) Imaging and certifying high-dimensional entanglement with a single-photon avalanche diode camera. npj Quantum Information, 6, 94. (doi: 10.1038/s41534-020-00324-8)

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Spatial correlations between two photons are the key resource in realising many quantum imaging schemes. Measurement of the bi-photon correlation map is typically performed using single-point scanning detectors or single-photon cameras based on charged coupled device (CCD) technology. However, both approaches are limited in speed due to the slow scanning and the low frame rate of CCD-based cameras, resulting in data acquisition times on the order of many hours. Here, we employ a high frame rate, single-photon avalanche diode (SPAD) camera, to measure the spatial joint probability distribution of a bi-photon state produced by spontaneous parametric down-conversion, with statistics taken over 107 frames. Through violation of an Einstein–Podolsky–Rosen criterion by 227 sigmas, we confirm the presence of spatial entanglement between our photon pairs. Furthermore, we certify, in just 140 s, an entanglement dimensionality of 48. Our work demonstrates the potential of SPAD cameras in the rapid characterisation of photonic entanglement, leading the way towards real-time quantum imaging and quantum information processing.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Defienne, Dr Hugo and Ndagano, Mr Bienvenu and Faccio, Professor Daniele and Starshynov, Mr Ilya and Lyons, Dr Ashley
Authors: Ndagano, B., Defienne, H., Lyons, A., Starshynov, I., Villa, F., Tisa, S., and Faccio, D.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:npj Quantum Information
Publisher:Nature Research
ISSN (Online):2056-6387
Copyright Holders:Copyright © The Author(s) 2020
First Published:First published in npj Quantum Information 6:94
Publisher Policy:Reproduced under a Creative Commons license

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
190841UK Quantum Technology Hub in Enhanced Quantum ImagingMiles PadgettEngineering and Physical Sciences Research Council (EPSRC)EP/M01326X/1P&S - Physics & Astronomy
301688Nano-scale imaging with Hong-Ou-Mandel InterferometryDaniele FaccioEngineering and Physical Sciences Research Council (EPSRC)EP/R030081/1P&S - Physics & Astronomy
305457Adaptive Optics for Quantum CommunicationDaniele FaccioEuropean Commission (EC)840958P&S - Physics & Astronomy