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

• URL: http://arxiv.org/abs/2409.04569v2
• Date: Wed, 11 Sep 2024 20:11:18 GMT
• Title: Quantum Pair Generation in Nonlinear Metasurfaces with Mixed and Pure Photon Polarizations
• Authors: Jiho Noh, Tomás Santiago-Cruz, Vitaliy Sultanov, Chloe F. Doiron, Sylvain D. Gennaro, Maria V. Chekhova, Igal Brener,
• Abstract summary: We present a solution by achieving polarization engineering of frequency-nondegenerate biphotons emitted via spontaneous parametric down-conversion. By performing a comprehensive polarization tomography, we demonstrate that the polarization of the emitted photons directly reflects the qBIC mode's far-field properties.
• Score: 0.09423257767158633
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Metasurfaces are highly effective at manipulating classical light in the linear regime; however, effectively controlling the polarization of non-classical light generated from nonlinear resonant metasurfaces remains a challenge. Here, we present a solution by achieving polarization engineering of frequency-nondegenerate biphotons emitted via spontaneous parametric down-conversion (SPDC) in GaAs metasurfaces, where quasi-bound states in the continuum (qBIC) resonances were utilized for boosting the biphoton generation. By performing a comprehensive polarization tomography, we demonstrate that the polarization of the emitted photons 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 towards utilizing metasurfaces to not only generate quantum light but also engineer their polarization, a critical aspect for future quantum technologies.

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