Electrically Reconfigurable NbOCl$_2$ Metasurface for Quantum Technologies
Fuente:
arXiv
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866912362261381120 |
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| author | Abdelraouf, Omar A. M. |
| author_facet | Abdelraouf, Omar A. M. |
| contents | Entangled photon-pair sources are foundational to advancing quantum technologies, including secure communication, quantum sensing, and imaging. For deployment in space-constrained environments such as satellite-based quantum networks or portable devices, compact, reconfigurable, and efficient entanglement sources are essential. Here, we present an electrically tunable entangled photon-pair source utilizing a nanostructured NbOCl$_2$ crystal, engineered for operation in the telecommunication C-band. The inherent non-centrosymmetric lattice symmetry of NbOCl$_2$ enables direct generation of polarization-entangled Bell states without the need for post-selection, leveraging its exceptional second-order nonlinear susceptibility, which surpasses conventional nonlinear materials. By nanopatterning NbOCl$_2$ into a high-quality-factor metasurface, we achieve three orders of magnitude enhancement in photon-pair generation efficiency via resonant excitation of bound states in the continuum resonance, which intensify light-matter interactions. Furthermore, we demonstrate in situ electrical tunability of the photon-pair emission wavelength over a 250 nm range from 1450 nm to 1700 nm by dynamically modulating surrounding liquid crystal layer. Remarkably, the decoupling of photon-pair generation rate and spectral tunability ensures high brightness, above 10,000 coincidences, under active tuning. The air stability and mechanical robustness of NbOCl$_2$ further enhance its practicality for real-world deployment. This work establishes NbOCl$_2$ as a superior material for scalable, on-chip quantum light sources, paving the way for integrated quantum communication systems, adaptive sensors, and portable quantum devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_03341 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electrically Reconfigurable NbOCl$_2$ Metasurface for Quantum Technologies Abdelraouf, Omar A. M. Optics Quantum Physics Entangled photon-pair sources are foundational to advancing quantum technologies, including secure communication, quantum sensing, and imaging. For deployment in space-constrained environments such as satellite-based quantum networks or portable devices, compact, reconfigurable, and efficient entanglement sources are essential. Here, we present an electrically tunable entangled photon-pair source utilizing a nanostructured NbOCl$_2$ crystal, engineered for operation in the telecommunication C-band. The inherent non-centrosymmetric lattice symmetry of NbOCl$_2$ enables direct generation of polarization-entangled Bell states without the need for post-selection, leveraging its exceptional second-order nonlinear susceptibility, which surpasses conventional nonlinear materials. By nanopatterning NbOCl$_2$ into a high-quality-factor metasurface, we achieve three orders of magnitude enhancement in photon-pair generation efficiency via resonant excitation of bound states in the continuum resonance, which intensify light-matter interactions. Furthermore, we demonstrate in situ electrical tunability of the photon-pair emission wavelength over a 250 nm range from 1450 nm to 1700 nm by dynamically modulating surrounding liquid crystal layer. Remarkably, the decoupling of photon-pair generation rate and spectral tunability ensures high brightness, above 10,000 coincidences, under active tuning. The air stability and mechanical robustness of NbOCl$_2$ further enhance its practicality for real-world deployment. This work establishes NbOCl$_2$ as a superior material for scalable, on-chip quantum light sources, paving the way for integrated quantum communication systems, adaptive sensors, and portable quantum devices. |
| title | Electrically Reconfigurable NbOCl$_2$ Metasurface for Quantum Technologies |
| topic | Optics Quantum Physics |
| url | https://arxiv.org/abs/2505.03341 |