Entangled Telecom Photon Generation using Twisted Van der Waals Crystals
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arXiv
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866909045738176512 |
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| author | Prasannan, Nidhin Mourzidis, Konstantinos Jindal, Vishwas Li, Hanting Lin, Di Yang, Wenchen Hu, Deng Yang, Liu Balocchi, Andrea Lagarde, Delphine Renucci, Pierre Wang, Zhiwei Wang, Gang Marie, Xavier |
| author_facet | Prasannan, Nidhin Mourzidis, Konstantinos Jindal, Vishwas Li, Hanting Lin, Di Yang, Wenchen Hu, Deng Yang, Liu Balocchi, Andrea Lagarde, Delphine Renucci, Pierre Wang, Zhiwei Wang, Gang Marie, Xavier |
| contents | Nanoscale quantum light sources are essential building blocks for integrated quantum photonic systems. Here, we report a wavelength-scale entangled-photon source based on van der Waals-engineered NbOBr$_2$, and benchmark its performance for telecom-wavelength quantum light generation. By exploiting the material's second-order nonlinearity, we generate quantum-correlated photon pairs via spontaneous parametric down-conversion. We then use a 90$^{\circ}$ twisted stacking to induce quantum interference in photon-pair generation, yielding polarization-entangled photons. This approach enables tunability of the quantum optical state via control of the excitation laser polarization. We experimentally obtain entanglement fidelities exceeding 95% for Bell states, along with a high coincidence-to-accidental ratio of $\sim$335, and a brightness approximately one order of magnitude higher than recently reported telecom sources based on transition metal dichalcogenide (TMD) 2D materials. These results establish twisted van der Waals engineering as a powerful platform for highly tunable, high-brightness quantum light sources at telecom wavelengths. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_14592 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Entangled Telecom Photon Generation using Twisted Van der Waals Crystals Prasannan, Nidhin Mourzidis, Konstantinos Jindal, Vishwas Li, Hanting Lin, Di Yang, Wenchen Hu, Deng Yang, Liu Balocchi, Andrea Lagarde, Delphine Renucci, Pierre Wang, Zhiwei Wang, Gang Marie, Xavier Optics Other Condensed Matter Quantum Physics Nanoscale quantum light sources are essential building blocks for integrated quantum photonic systems. Here, we report a wavelength-scale entangled-photon source based on van der Waals-engineered NbOBr$_2$, and benchmark its performance for telecom-wavelength quantum light generation. By exploiting the material's second-order nonlinearity, we generate quantum-correlated photon pairs via spontaneous parametric down-conversion. We then use a 90$^{\circ}$ twisted stacking to induce quantum interference in photon-pair generation, yielding polarization-entangled photons. This approach enables tunability of the quantum optical state via control of the excitation laser polarization. We experimentally obtain entanglement fidelities exceeding 95% for Bell states, along with a high coincidence-to-accidental ratio of $\sim$335, and a brightness approximately one order of magnitude higher than recently reported telecom sources based on transition metal dichalcogenide (TMD) 2D materials. These results establish twisted van der Waals engineering as a powerful platform for highly tunable, high-brightness quantum light sources at telecom wavelengths. |
| title | Entangled Telecom Photon Generation using Twisted Van der Waals Crystals |
| topic | Optics Other Condensed Matter Quantum Physics |
| url | https://arxiv.org/abs/2605.14592 |