Integrated bright source of polarization-entangled photons using lithium niobate photonic chips
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908428132155392 |
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| author | Kim, Changhyun Kim, Hansol Choi, Minho Lee, Junhyung Park, Yongchan Moon, Sunghyun Lee, Jinil Hwang, Hyeon Seo, Min-Kyo Kim, Yoon-Ho Kim, Yong-Su Jung, Hojoong Kwon, Hyounghan |
| author_facet | Kim, Changhyun Kim, Hansol Choi, Minho Lee, Junhyung Park, Yongchan Moon, Sunghyun Lee, Jinil Hwang, Hyeon Seo, Min-Kyo Kim, Yoon-Ho Kim, Yong-Su Jung, Hojoong Kwon, Hyounghan |
| contents | Quantum photonics has rapidly advanced as a key area for developing quantum technologies by harnessing photons' inherent quantum characteristics, particularly entanglement. Generation of entangled photon pairs, known as Bell states, is crucial for quantum communications, precision sensing, and quantum computing. While bulk quantum optical setups have provided foundational progress, integrated quantum photonic platforms now offer superior scalability, efficiency, and integrative potential. In this study, we demonstrate a compact and bright source of polarization-entangled Bell state utilizing continuous-wave pumping on thin film lithium niobate (TFLN) integrated photonics. Our periodically poled lithium niobate device achieves on-chip brightness of photon pair generation rate of 508.5 MHz/mW, surpassing other integrated platforms including silicon photonics. This demonstration marks the first realization of polarization entanglement on TFLN platforms. Experimentally measured metrics confirm high-quality entangled photon pairs with a purity of 0.901, a concurrence of 0.9, and a fidelity of 0.944. We expect our compact quantum devices to have great potential for advancing quantum communication systems and photonic quantum technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_23625 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Integrated bright source of polarization-entangled photons using lithium niobate photonic chips Kim, Changhyun Kim, Hansol Choi, Minho Lee, Junhyung Park, Yongchan Moon, Sunghyun Lee, Jinil Hwang, Hyeon Seo, Min-Kyo Kim, Yoon-Ho Kim, Yong-Su Jung, Hojoong Kwon, Hyounghan Optics Quantum Physics Quantum photonics has rapidly advanced as a key area for developing quantum technologies by harnessing photons' inherent quantum characteristics, particularly entanglement. Generation of entangled photon pairs, known as Bell states, is crucial for quantum communications, precision sensing, and quantum computing. While bulk quantum optical setups have provided foundational progress, integrated quantum photonic platforms now offer superior scalability, efficiency, and integrative potential. In this study, we demonstrate a compact and bright source of polarization-entangled Bell state utilizing continuous-wave pumping on thin film lithium niobate (TFLN) integrated photonics. Our periodically poled lithium niobate device achieves on-chip brightness of photon pair generation rate of 508.5 MHz/mW, surpassing other integrated platforms including silicon photonics. This demonstration marks the first realization of polarization entanglement on TFLN platforms. Experimentally measured metrics confirm high-quality entangled photon pairs with a purity of 0.901, a concurrence of 0.9, and a fidelity of 0.944. We expect our compact quantum devices to have great potential for advancing quantum communication systems and photonic quantum technologies. |
| title | Integrated bright source of polarization-entangled photons using lithium niobate photonic chips |
| topic | Optics Quantum Physics |
| url | https://arxiv.org/abs/2506.23625 |