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Cited by 195Metamaterials and Metasurfaces ApplicationsQuantum Information and CryptographyPhotorefractive and Nonlinear Optics

Spatially entangled photon pairs from lithium niobate nonlocal metasurfaces

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Zhang, Jihua, Ma, Jinyong, Parry, Matthew, Cai, Marcus, Camacho-Morales, Rocio, Xu, Lei, Neshev, Dragomir N., Sukhorukov, Andrey A.·2022·Science Advances
DOI 10.1126/sciadv.abq4240PMC PMC9337756
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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.

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  • All-dielectric metasurfaces exhibit much lower loss and higher damage thresholds compared to plasmonic counterparts.

    “all-dielectric metasurfaces exhibit much lower loss and higher damage thresholds”

    From Inverse Design of an All-Dielectric Nonlinear Polaritonic Metasurface. (2025) · cites this paper as [11]

    The Results section describes a dielectric meta-grating and reports its optical resonance and nonlinear enhancement, but does not compare its loss or damage threshold with plasmonic metasurfaces. Searches for lower loss and higher damage thresholds found no passage addressing those comparisons; page numbers were not available in our copy. (LLM, conf=0.73)

    Experimental — accuracy not yet measured

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Authors
Zhang, J., Ma, J., Parry, M., Cai, M., Camacho-Morales, R., Xu, L., Neshev, D. N., & Sukhorukov, A. A.
Affiliations
  • Australian National University (AU)
  • ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS), Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia.
  • Nottingham Trent University (GB)
Corresponding author
  • Zhang, Jihua
  • Ma, Jinyong
  • Sukhorukov, Andrey A.
ORCID
Venue
Science Advances
Publisher
American Association for the Advancement of Science (AAAS)
Published
2022-07-29
Volume
8
Issue
30
Pages
eabq4240-eabq4240
ISSN
2375-2548 (ISSN-L)
DOI
10.1126/sciadv.abq4240
PMC
PMC9337756
OpenAlex
W4226317165
Cited by
195
References
1
Citations by year
2026: 36 · 2025: 73 · 2024: 44 · 2023: 35 · 2022: 7
FWCI
9.16
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Science Advances (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
  • Nottingham Trent University's Institutional Repository (Nottingham Trent Repository) (submittedVersion, cc-by-nc)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Metamaterials and Metasurfaces Applications
  • Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Photorefractive and Nonlinear Optics
Keywords
spatial entanglement, photon pair entanglement, lithium niobate, nonlocal metasurfaces, spontaneous parametric down-conversion, Cauchy-Schwarz inequality violation, multimode entanglement, high quality factor resonances

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