+86-10-62783389 中文
返回

Ph.D candidate Jingyuan Liu’s work about “High-dimensional quantum key distribution using energy-time entanglement over 242 km partially deployed fiber” was published on Quantum Science and Technology

Entanglement-based quantum key distribution (QKD) is an essential ingredient in quantum communication, owing to the property of source-independent security and the potential on constructing large-scale quantum communication networks. However, implementation of entanglement-based QKD over long-distance optical fiber links is still challenging, especially over deployed fibers. In this work, we report an experimental QKD using energy-time entangled photon pairs that transmit over optical fibers of 242 km (including a section of 19 km deployed fibers). The QKD is realized through the protocol of dispersive-optics QKD (DO-QKD) with high-dimensional encoding to utilize coincidence counts more efficiently. A reliable, high-accuracy time synchronization technology for long-distance entanglement-based QKD is developed based on the distribution of optical pulses in quantum channels. Our system operates continuously for more than 7 d without active polarization or phase calibration, showing the stability and robustness of the system. After error correction and privacy amplification, we ultimately generate secure keys in the asymptotic and finite-size regimes, respectively. It shows great potential for realizing entanglement-based QKD in large-scale optical fiber networks.

This work has published on Quantum Science and Technology (Quantum Sci. Technol. 9 (2024) 015003. https://doi.org/10.1088/2058-9565/acfe37) at 12th Oct. 2023. The first author of this paper is Ph.D candidate Jingyuan Liu. The corresponding author of this paper is Prof. Wei Zhang. Quantum Science and Technology is a highly selective journal published by IOP Publishing. It is dedicated to bringing together the latest and most important results and perspectives from across the emerging field of quantum science and technology.

图片1.png

2023年11月06日

News

Congratulations to Prof. Yidong Huang on her election as an International Member of the United States National Academy of Engineering (NAE)2024-02-13

Hao Sun was appointed as a member of the Nano-Optoelectronic Display Technology Standardization Working Group2023-12-29

The second steering committee meeting of Tsinghua University-Zhuhai Huafa Industrial Share Company Joint Institute for Architecture Optoelectronic Technologies (JIAOT) was held successfully2023-12-25

The Advanced Light Computing Display R&D Center Launched2023-12-22

Faculty members of our lab. attended and gave talks at the World Conference on Opto-electronic science and technology (O-WEST 2023)2023-12-20

Nanjing Iron and Steel Group visited our laboratory2023-12-08

Professor Wei Zhang gave an invited talk at the 5th Young Scientists Forum on Integrated Quantum Photonics 2023-12-06

Prof. Yidong Huang was invited to participate in the 16th International Forum on Innovation and Industrialization of Micron/Nanotechnology and the Beijing Advanced Sensor Symposium2023-11-28

Prof. Xue Feng and Kaiyu Feng Delivered Invited Talks on the Seventh Conference on Micro-Nano Optical Technology and Application (MOTA2023)2023-11-21

Prof. Yidong Huang, Prof. Wei Zhang, and Ph.D. candidate Zhexuan Wang attended the conference "Optics and Photonics in Africa 2023" and gave invited talks.2023-11-14

The 6th anniversary celebration of H-Chip Technology2023-11-08

Ph.D candidate Jingyuan Liu’s work about “High-dimensional quantum key distribution using energy-time entanglement over 242 km partially deployed fiber” was published on Quantum Science and Technology2023-11-06

The 4th Graduates Gatherings of our Lab. was successfully held2023-10-31

The laboratory organized a meeting for mentors and 2023 undergraduate freshmen2023-10-29

Prof. Huang Yidong was invited to participate in the 2023 Binhai Talent Summit in Tianjin2023-10-25