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Chin. Phys. B, 2017, Vol. 26(11): 110304    DOI: 10.1088/1674-1056/26/11/110304
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Balancing four-state continuous-variable quantum key distribution with linear optics cloning machine

Xiao-Dong Wu(吴晓东)1, Qin Liao(廖骎)1, Duan Huang(黄端)1,2, Xiang-Hua Wu(吴湘华)1, Ying Guo(郭迎)1,3
1. School of Information Science and Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Advanced Optical Communication Systems and Networks, Center of Quantum Information Sensing and Processing, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
3. School of Engineering and Information Technology, University of New South Wales, Canberra, ACT 2610, Australia
Abstract  We show that the secret key generation rate can be balanced with the maximum secure distance of four-state continuous-variable quantum key distribution (CV-QKD) by using the linear optics cloning machine (LOCM). Benefiting from the LOCM operation, the LOCM-tuned noise can be employed by the reference partner of reconciliation to achieve higher secret key generation rates over a long distance. Simulation results show that the LOCM operation can flexibly regulate the secret key generation rate and the maximum secure distance and improve the performance of four-state CV-QKD protocol by dynamically tuning parameters in an appropriate range.
Keywords:  four states      linear optics cloning machine      quantum key distribution     
Received:  23 February 2017      Published:  05 November 2017
PACS:  03.67.-a (Quantum information)  
  03.67.Bg (Entanglement production and manipulation)  
  03.67.Dd (Quantum cryptography and communication security)  
  03.67.Hk (Quantum communication)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61379153 and 61572529).
Corresponding Authors:  Duan Huang, Ying Guo     E-mail:  duan.huang@foxmail.com;guoyingcsu@sina.com

Cite this article: 

Xiao-Dong Wu(吴晓东), Qin Liao(廖骎), Duan Huang(黄端), Xiang-Hua Wu(吴湘华), Ying Guo(郭迎) Balancing four-state continuous-variable quantum key distribution with linear optics cloning machine 2017 Chin. Phys. B 26 110304

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