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

Ndagano, Bienvenu, Defienne, Hugo, Lyons, Ashley, Starshynov, Ilya, Villa, Federica, Tisa, Simone, Faccio, Daniele·2020·npj Quantum Information
DOI 10.1038/s41534-020-00324-8
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Abstract

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 10 7 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.

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Metadata

Authors
Ndagano, B., Defienne, H., Lyons, A., Starshynov, I., Villa, F., Tisa, S., & Faccio, D.
ORCID
Venue
npj Quantum Information
Publisher
Springer Science and Business Media LLC
Published
2020-12-04
Volume
6
Issue
1
ISSN
2056-6387
DOI
10.1038/s41534-020-00324-8
Cited by
76
References
0
Language
en
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