Spatially entangled photon pairs from lithium niobate nonlocal metasurfaces

Zhang, J., Ma, J., Parry, M., Cai, M., Camacho-Morales, R., Xu, L. ORCID: 0000-0001-9071-4311, Neshev, D.N. and Sukhorukov, A.A., 2022. Spatially entangled photon pairs from lithium niobate nonlocal metasurfaces. Science Advances, 8 (30). ISSN 2375-2548

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Abstract

Metasurfaces consisting of nanoscale structures are underpinning new physical principles for the creation and shaping of quantum states of light. Multiphoton states that are entangled in spatial or angular domains are an essential resource for many quantum applications; however, their production traditionally relies on bulky nonlinear crystals. We predict and demonstrate experimentally the generation of spatially entangled photon pairs through spontaneous parametric down-conversion from a metasurface incorporating a nonlinear thin film of lithium niobate covered by a silica meta-grating. We measure the correlations of photon pairs and identify their spatial antibunching through violation of the classical Cauchy-Schwarz inequality, witnessing the presence of multimode entanglement. Simultaneously, the photon-pair rate is strongly enhanced by 450 times as compared to unpatterned films because of high-quality-factor resonances. These results pave the way to miniaturization of various quantum devices by incorporating ultrathin metasurfaces functioning as room temperature sources of quantum-entangled photons.

Item Type: Journal article
Publication Title: Science Advances
Creators: Zhang, J., Ma, J., Parry, M., Cai, M., Camacho-Morales, R., Xu, L., Neshev, D.N. and Sukhorukov, A.A.
Publisher: American Association for the Advancement of Science
Date: 29 July 2022
Volume: 8
Number: 30
ISSN: 2375-2548
Identifiers:
NumberType
10.1126/sciadv.abq4240DOI
1578527Other
Rights: This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
Divisions: Schools > School of Science and Technology
Record created by: Jonathan Gallacher
Date Added: 02 Aug 2022 10:27
Last Modified: 02 Aug 2022 10:27
URI: http://irep.ntu.ac.uk/id/eprint/46806

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