Integrated polarization-entangled photon source for wavelength-multiplexed quantum networks
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908679748452352 |
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| author | Shi, Xiaodong Li, Yue Du, Jinyi Zhou, Lin Yang, Ran Lim, En Teng Mohanraj, Sakthi Sanjeev Zhao, Mengyao Chen, Xu Wang, Xiaojie Wu, Guangxing Hao, Hao Dhyani, Veerendra Wang, Sihao Ling, Alexander Zhu, Di |
| author_facet | Shi, Xiaodong Li, Yue Du, Jinyi Zhou, Lin Yang, Ran Lim, En Teng Mohanraj, Sakthi Sanjeev Zhao, Mengyao Chen, Xu Wang, Xiaojie Wu, Guangxing Hao, Hao Dhyani, Veerendra Wang, Sihao Ling, Alexander Zhu, Di |
| contents | Entangled photons are fundamental resources for quantum communication, computing, and networking. Among them, polarization-entangled photon pairs play an important role due to their straightforward state manipulation and direct use in quantum key distribution, teleportation, and network protocols. However, realizing compact, efficient, and scalable polarization-entangled sources that meet the requirements of practical deployment remains a major challenge. Here, we present a simple yet high-performance on-chip polarization-entangled photon-pair source on thin-film lithium niobate (TFLN). Our device employs dual quasi-phase matching (D-QPM) that sequentially supports type-0 and type-I spontaneous parametric down-conversion in a single nanophotonic waveguide, eliminating the need for interferometers, polarization rotators, or other complex circuits. The source directly produces high-fidelity Bell states with broad bandwidth, high brightness, and low noise. Using this integrated platform, we realize wavelength-multiplexed entanglement distribution in a four-user quantum network deployed over metropolitan fiber links up to 50 km. These results establish a robust and scalable pathway toward practical quantum communication systems and multi-user quantum mesh networks based on integrated photonics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_22680 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Integrated polarization-entangled photon source for wavelength-multiplexed quantum networks Shi, Xiaodong Li, Yue Du, Jinyi Zhou, Lin Yang, Ran Lim, En Teng Mohanraj, Sakthi Sanjeev Zhao, Mengyao Chen, Xu Wang, Xiaojie Wu, Guangxing Hao, Hao Dhyani, Veerendra Wang, Sihao Ling, Alexander Zhu, Di Optics Quantum Physics Entangled photons are fundamental resources for quantum communication, computing, and networking. Among them, polarization-entangled photon pairs play an important role due to their straightforward state manipulation and direct use in quantum key distribution, teleportation, and network protocols. However, realizing compact, efficient, and scalable polarization-entangled sources that meet the requirements of practical deployment remains a major challenge. Here, we present a simple yet high-performance on-chip polarization-entangled photon-pair source on thin-film lithium niobate (TFLN). Our device employs dual quasi-phase matching (D-QPM) that sequentially supports type-0 and type-I spontaneous parametric down-conversion in a single nanophotonic waveguide, eliminating the need for interferometers, polarization rotators, or other complex circuits. The source directly produces high-fidelity Bell states with broad bandwidth, high brightness, and low noise. Using this integrated platform, we realize wavelength-multiplexed entanglement distribution in a four-user quantum network deployed over metropolitan fiber links up to 50 km. These results establish a robust and scalable pathway toward practical quantum communication systems and multi-user quantum mesh networks based on integrated photonics. |
| title | Integrated polarization-entangled photon source for wavelength-multiplexed quantum networks |
| topic | Optics Quantum Physics |
| url | https://arxiv.org/abs/2511.22680 |