On-chip quantum key distribution over field-deployed fiber using lithium niobate photonic circuit
Quantum key distribution (QKD) systems have proven their theoretically unconditional security by quantum mechanics, but the scalability and cost barriers limit the rapid growth of the QKD system industry. The integration of QKD systems on chips has enabled their widespread adoption in secure quantum...
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| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2025-03-01
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| Series: | APL Photonics |
| Online Access: | http://dx.doi.org/10.1063/5.0223694 |
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| author | Hyungjun Heo Min Ki Woo Chang-Hoon Park Hyeong-Soon Jang Hyeon Hwang Hansuek Lee Min-Kyo Seo Sangin Kim Hyounghan Kwon Hojoong Jung Sang-Wook Han |
| author_facet | Hyungjun Heo Min Ki Woo Chang-Hoon Park Hyeong-Soon Jang Hyeon Hwang Hansuek Lee Min-Kyo Seo Sangin Kim Hyounghan Kwon Hojoong Jung Sang-Wook Han |
| author_sort | Hyungjun Heo |
| collection | DOAJ |
| description | Quantum key distribution (QKD) systems have proven their theoretically unconditional security by quantum mechanics, but the scalability and cost barriers limit the rapid growth of the QKD system industry. The integration of QKD systems on chips has enabled their widespread adoption in secure quantum communication technologies, but the optimized platforms and designs are still being studied. Herein, we fabricated monolithic quantum photonic circuits for the BB84 QKD protocol using thin-film lithium niobate (TFLN), which enables flexible design in organizing both active and passive elements on one chip based on its superior material properties. The proposed circuit design for both transmitter and receiver parts are identical, which facilitates stable operation and mass production. Using our device, we demonstrated QKD over a field-deployed quantum channel, and its performance is comparable to state-of-the-art. This result proved the potential of TFLN for quantum communication technology. |
| format | Article |
| id | doaj-art-f8da27c8a6ff4eb6a072b8eedee5c5a6 |
| institution | OA Journals |
| issn | 2378-0967 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Photonics |
| spelling | doaj-art-f8da27c8a6ff4eb6a072b8eedee5c5a62025-08-20T01:55:52ZengAIP Publishing LLCAPL Photonics2378-09672025-03-01103031301031301-910.1063/5.0223694On-chip quantum key distribution over field-deployed fiber using lithium niobate photonic circuitHyungjun Heo0Min Ki Woo1Chang-Hoon Park2Hyeong-Soon Jang3Hyeon Hwang4Hansuek Lee5Min-Kyo Seo6Sangin Kim7Hyounghan Kwon8Hojoong Jung9Sang-Wook Han10Technological Convergence Center, Korea Institute of Science and Technology (KIST), Seoul 02792, South KoreaCenter for Quantum Technology, Korea Institute of Science and Technology (KIST), Seoul 02792, South KoreaCenter for Quantum Technology, Korea Institute of Science and Technology (KIST), Seoul 02792, South KoreaCenter for Quantum Technology, Korea Institute of Science and Technology (KIST), Seoul 02792, South KoreaDepartment of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South KoreaDepartment of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South KoreaDepartment of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South KoreaDepartment of Electrical and Computer Engineering, Ajou University, Suwon 16499, South KoreaCenter for Quantum Technology, Korea Institute of Science and Technology (KIST), Seoul 02792, South KoreaCenter for Quantum Technology, Korea Institute of Science and Technology (KIST), Seoul 02792, South KoreaCenter for Quantum Technology, Korea Institute of Science and Technology (KIST), Seoul 02792, South KoreaQuantum key distribution (QKD) systems have proven their theoretically unconditional security by quantum mechanics, but the scalability and cost barriers limit the rapid growth of the QKD system industry. The integration of QKD systems on chips has enabled their widespread adoption in secure quantum communication technologies, but the optimized platforms and designs are still being studied. Herein, we fabricated monolithic quantum photonic circuits for the BB84 QKD protocol using thin-film lithium niobate (TFLN), which enables flexible design in organizing both active and passive elements on one chip based on its superior material properties. The proposed circuit design for both transmitter and receiver parts are identical, which facilitates stable operation and mass production. Using our device, we demonstrated QKD over a field-deployed quantum channel, and its performance is comparable to state-of-the-art. This result proved the potential of TFLN for quantum communication technology.http://dx.doi.org/10.1063/5.0223694 |
| spellingShingle | Hyungjun Heo Min Ki Woo Chang-Hoon Park Hyeong-Soon Jang Hyeon Hwang Hansuek Lee Min-Kyo Seo Sangin Kim Hyounghan Kwon Hojoong Jung Sang-Wook Han On-chip quantum key distribution over field-deployed fiber using lithium niobate photonic circuit APL Photonics |
| title | On-chip quantum key distribution over field-deployed fiber using lithium niobate photonic circuit |
| title_full | On-chip quantum key distribution over field-deployed fiber using lithium niobate photonic circuit |
| title_fullStr | On-chip quantum key distribution over field-deployed fiber using lithium niobate photonic circuit |
| title_full_unstemmed | On-chip quantum key distribution over field-deployed fiber using lithium niobate photonic circuit |
| title_short | On-chip quantum key distribution over field-deployed fiber using lithium niobate photonic circuit |
| title_sort | on chip quantum key distribution over field deployed fiber using lithium niobate photonic circuit |
| url | http://dx.doi.org/10.1063/5.0223694 |
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