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Quantum Pair Generation in Nonlinear Metasurfaces with Mixed and Pure Photon Polarizations

Journal Article · · Nano Letters

Metasurfaces are highly effective at manipulating classical light in the linear regime; however, effectively controlling the polarization of nonclassical light generated from nonlinear resonant metasurfaces remains a challenge. Here, in this study, we present a solution by achieving polarization engineering of frequency-nondegenerate biphotons emitted via spontaneous parametric down-conversion in GaAs metasurfaces, utilizing quasi-bound states in the continuum (qBIC) resonances to enhance biphoton generation. Through comprehensive polarization tomography, we demonstrate that the emitted photons’ polarization directly reflects the qBIC mode’s far-field properties. Furthermore, we show that both the type of qBIC mode and the symmetry of the meta-atoms can be tailored to control each single-photon polarization state, and that the subsequent two-photon polarization states are nearly separable, offering potential applications in the heralded generation of single photons with adjustable polarization. This work provides a significant step toward utilizing metasurfaces to generate quantum light and engineer their polarization, a critical aspect for future quantum technologies.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
NA0003525
OSTI ID:
2498464
Report Number(s):
SAND--2025-00045J
Journal Information:
Nano Letters, Journal Name: Nano Letters Journal Issue: 48 Vol. 24; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (25)

Photon Pairs from Resonant Metasurfaces journal May 2021
Polarization Engineering of Entangled Photons from a Lithium Niobate Nonlinear Metasurface journal August 2023
Inverse Design of Photonic Crystals through Automatic Differentiation journal June 2020
Bound states in the continuum journal July 2016
A tunable transition metal dichalcogenide entangled photon-pair source journal September 2024
Tunable entangled photon-pair generation in a liquid crystal journal June 2024
Photon pairs bi-directionally emitted from a resonant metasurface journal January 2023
Luminescence-induced noise in single photon sources based on BBO crystals journal October 2014
Idealized Einstein-Podolsky-Rosen states from non–phase-matched parametric down-conversion journal January 2020
Mixed-state entanglement and quantum error correction journal November 1996
Measurement of qubits journal October 2001
Synthesizing arbitrary two-photon polarization mixed states journal March 2005
Polarization states of four-dimensional systems based on biphotons journal June 2006
Asymmetric Metasurfaces with High- Q Resonances Governed by Bound States in the Continuum journal November 2018
Microscale Generation of Entangled Photons without Momentum Conservation journal December 2019
Entanglement of Formation of an Arbitrary State of Two Qubits journal March 1998
Nonmaximally Entangled States: Production, Characterization, and Utilization journal October 1999
Spatially entangled photon pairs from lithium niobate nonlocal metasurfaces journal July 2022
Metalens-array–based high-dimensional and multiphoton quantum source journal June 2020
Resonant metasurfaces for generating complex quantum states journal August 2022
Entangled photons from subwavelength nonlinear films journal January 2021
Flat-optics generation of broadband photon pairs with tunable polarization entanglement journal July 2022
Spontaneous photon-pair generation from a dielectric nanoantenna journal January 2019
Directionally tunable co- and counterpropagating photon pairs from a nonlinear metasurface journal June 2024
Polarization-entangled photon pair generation from an epsilon-near-zero metasurface preprint January 2024