40-user fully connected entanglement-based quantum key distribution network without trusted node
Xu Liu,
Jingyuan Liu,
Rong Xue,
Heqing Wang,
Hao Li,
Xue Feng,
Fang Liu,
Kaiyu Cui,
Zhen Wang,
Lixing You,
Yidong Huang,
Wei Zhang
Affiliations
Xu Liu
Beijing National Research Center for Information Science and Technology (BNRist), Beijing Innovation Center for Future Chips, Department of Electronic Engineering, Tsinghua University
Jingyuan Liu
Beijing National Research Center for Information Science and Technology (BNRist), Beijing Innovation Center for Future Chips, Department of Electronic Engineering, Tsinghua University
Rong Xue
Beijing National Research Center for Information Science and Technology (BNRist), Beijing Innovation Center for Future Chips, Department of Electronic Engineering, Tsinghua University
Heqing Wang
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
Hao Li
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
Xue Feng
Beijing National Research Center for Information Science and Technology (BNRist), Beijing Innovation Center for Future Chips, Department of Electronic Engineering, Tsinghua University
Fang Liu
Beijing National Research Center for Information Science and Technology (BNRist), Beijing Innovation Center for Future Chips, Department of Electronic Engineering, Tsinghua University
Kaiyu Cui
Beijing National Research Center for Information Science and Technology (BNRist), Beijing Innovation Center for Future Chips, Department of Electronic Engineering, Tsinghua University
Zhen Wang
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
Lixing You
State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences
Yidong Huang
Beijing National Research Center for Information Science and Technology (BNRist), Beijing Innovation Center for Future Chips, Department of Electronic Engineering, Tsinghua University
Wei Zhang
Beijing National Research Center for Information Science and Technology (BNRist), Beijing Innovation Center for Future Chips, Department of Electronic Engineering, Tsinghua University
Abstract Quantum key distribution (QKD) would play an important role in future information technologies due to its theoretically proven security based on the laws of quantum mechanics. How to realize QKDs among multiple users in an effective and simple way is crucial for its real applications in communication networks. In this work, we propose and demonstrate a fully connected QKD network without trusted node for a large number of users. Using flexible wavelength division multiplexing/demultiplexing and space division multiplexing, entanglement resources generated by a broadband energy-time entangled quantum light source are distributed to 40 users. Any two users share a part of entanglement resources, by which QKD is established between them. As a result, it realizes a fully connected network with 40 users and 780 QKD links. The performance of this network architecture is also discussed theoretically, showing its potential on developing quantum communication networks with large user numbers owing to its simplicity, scalability, and high efficiency.
