Programmable linear quantum networks with a multimode fibre

Leedumrongwatthanakun, S., Innocenti, L., Defienne, H. , Juffmann, T., Ferraro, A., Paternostro, M. and Gigan, S. (2020) Programmable linear quantum networks with a multimode fibre. Nature Photonics, 14(3), pp. 139-142. (doi: 10.1038/s41566-019-0553-9)

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Abstract

Reconfigurable quantum circuits are fundamental building blocks for the implementation of scalable quantum technologies. Their implementation has been pursued in linear optics through the engineering of sophisticated interferometers1,2,3. Although such optical networks have been successful in demonstrating the control of small-scale quantum circuits, scaling up to larger dimensions poses significant challenges4,5. Here, we demonstrate a potentially scalable route towards reconfigurable optical networks based on the use of a multimode fibre and advanced wavefront shaping techniques. We program networks involving spatial and polarization modes of the fibre and experimentally validate the accuracy and robustness of our approach using two-photon quantum states. In particular, we illustrate the reconfigurability of our platform by emulating a tunable coherent absorption experiment6. By demonstrating reliable reprogrammable linear transformations, with the prospect to scale, our results highlight the potential of complex media driven by wavefront shaping for quantum information processing.

Item Type:Articles
Additional Information:The work is supported by the European Research Council (ERC) (724473). S.G. is a member of the Institut Universitaire de France (IUF). M.P. is supported by the European Commission through the H2020 Collaborative project ‘Testing the large-scale limit of quantum mechanics’ (TEQ, grant no. 766900), the Science Foundation Ireland–Department for Economy Investigator Programme ‘Quantum control of nanostructures for quantum networking’ (QuNaNet, grant no. 15/IA/2864), the Leverhulme Trust through the Research Project Grant ‘Ultracold quantum thermo-machine’ (UltraQuTe, grant no. RGP-2018-266), MSCA co-funding of regional, national and international programmes (grant no. 754507) and COST Action CA15220 ‘Quantum technologies in space (QTSpace)’. L.I. acknowledges partial support from Fondazione Angelo Della Riccia. T.J. was supported by a Human Frontier Science Program Cross-Disciplinary Fellowship (LT000345/2016-C), and ERC (758752). S.L. acknowledges support from a Franco-Thai Scholarship.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Defienne, Dr Hugo
Authors: Leedumrongwatthanakun, S., Innocenti, L., Defienne, H., Juffmann, T., Ferraro, A., Paternostro, M., and Gigan, S.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Nature Photonics
Publisher:Nature Publishing Group
ISSN:1749-4885
ISSN (Online):1749-4893
Published Online:02 December 2019
Copyright Holders:Copyright © 2019 Springer Nature
First Published:First published in Nature Photonics
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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