title: Long-distance continuous-variable quantum key distribution by controlling excess noise.
abstract: Quantum cryptography founded on the laws of physics could revolutionize the way in which communication information is protected. Significant progresses in long-distance quantum key distribution based on discrete variables have led to the secure quantum communication in real-world conditions being available. However, the alternative approach implemented with continuous variables has not yet reached the secure distance beyond 100 km. Here, we overcome the previous range limitation by controlling system excess noise and report such a long distance continuous-variable quantum key distribution experiment. Our result paves the road to the large-scale secure quantum communication with continuous variables and serves as a stepping stone in the quest for quantum network.
authors.affiliation: State Key Laboratory of Advanced Optical Communication Systems and Networks, and Center of Quantum Information Sensing and Processing, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Duan
authors.initials: D
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Advanced Optical Communication Systems and Networks, and Center of Quantum Information Sensing and Processing, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Advanced Optical Communication Systems and Networks, and Center of Quantum Information Sensing and Processing, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Dakai
authors.initials: D
authors.lastname: Lin
authors.affiliation: State Key Laboratory of Advanced Optical Communication Systems and Networks, and Center of Quantum Information Sensing and Processing, Shanghai Jiao Tong University, Shanghai 200240, China.|College of Information Science and Technology, Northwest University, Xi'an 710127, Shaanxi, China.
authors.forename: Guihua
authors.initials: G
authors.lastname: Zeng