Quantum networks play a pivotal role in the advancement of quantum technologies,expanding the scope of applications and communication distances.However,the absence of practical quantum repeaters poses a significant ob...Quantum networks play a pivotal role in the advancement of quantum technologies,expanding the scope of applications and communication distances.However,the absence of practical quantum repeaters poses a significant obstacle to large-scale network construction.Trusted repeater networks,on the other hand,utilize classical trusted repeaters to connect users,thereby sacrificing the information-theoretic security advantage inherent in quantum communication.In this study,we propose a scheme for constructing a fully quantum network in which any two users are directly connected via a switchable optical router,ensuring information-theoretic security across the entire network with existing technologies.Considering that the practical point-to-point quantum communication distance in optical fibers has reached 100 km,our scheme effectively addresses the challenge of building a fully quantum network within an urban area.A 40-km-long functional quantum network has been established using commercial optical links,enabling full operations of tasks such as quantum secure direct communication and quantum key distribution.展开更多
基金funded by the National Natural Science Foundation of China(Grant No.62471046)funded by the National Natural Science Foundation of China(Grant No.12204051)+3 种基金funded by the National Natural Science Foundation of China(Grant Nos.62501057,62131002)the National Natural Science Foundation of China(Grant No.12205011)the Young Elite Scientists Sponsorship Program by CAST(Grant No.2022QNRC001)funded by the Young Elite Scientists Sponsorship Program by CAST(Grant No.YESS20240786)。
文摘Quantum networks play a pivotal role in the advancement of quantum technologies,expanding the scope of applications and communication distances.However,the absence of practical quantum repeaters poses a significant obstacle to large-scale network construction.Trusted repeater networks,on the other hand,utilize classical trusted repeaters to connect users,thereby sacrificing the information-theoretic security advantage inherent in quantum communication.In this study,we propose a scheme for constructing a fully quantum network in which any two users are directly connected via a switchable optical router,ensuring information-theoretic security across the entire network with existing technologies.Considering that the practical point-to-point quantum communication distance in optical fibers has reached 100 km,our scheme effectively addresses the challenge of building a fully quantum network within an urban area.A 40-km-long functional quantum network has been established using commercial optical links,enabling full operations of tasks such as quantum secure direct communication and quantum key distribution.
