Year: 2025
Type: article
Abstract: Quantum networks, which hinge on the principles of quantum mechanics, are revolutionizing the domain of information technology. The vision for quantum networks involves the efficient distribution and utilization of quantum resources to support diverse applications, yet existing protocols face compatibility issues that limit the functional scalability. In this paper, a framework is proposed for the compatible and complementary implementation of quantum time synchronization and quantum cryptography, by multiplexing the same energy‐time entangled biphotons and quantum channel. A proof‐of‐principle experiment between two independent nodes across a 120 km fiber is demonstrated, which achieves sub‐picosecond synchronization stability based on the quantum two‐way time transfer protocol. Simultaneously, this synchronization provides the required timing for enabling dispersive optics quantum key distribution with an average finite‐size secure key rate of 73.8 bits per second. Furthermore, the performance degradation induced by asymmetric delay attacks in the quantum channel is effectively mitigated by the parallel quantum time synchronization procedure. This work advances energy‐time entanglement potential and paves the way for a resource‐efficient, function‐scalable, and highly compatible quantum network.
Source: Laser & Photonics Review
Authors: Xiao Xiang, Jingyuan Liu, Bingke Shi, Huibo Hong, Xizi Sun, Yuting Liu, Runai Quan, Tao Liu, Shougang Zhang, Wei Zhang, Ruifang Dong
Institutions: Chinese Academy of Sciences, National Time Service Center, University of Chinese Academy of Sciences, State Key Laboratory of Low-Dimensional Quantum Physics, Frontier Science Center for Quantum Information of the Ministry of Education of China, Tsinghua University, Beijing Academy of Quantum Information Sciences
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4411376365