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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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 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 |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| 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: | 2056-6387 |
| 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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