Subcarrier multiplexing multiple-input multiple-output quantum key distribution scheme with orthogonal quantum states

被引：11

作者：

Xiao, Hailin ^{[1
,2
,3
]}

Zhang, Zhongshan ^{[4
]}

机构：

[1] Wenzhou Univ, Coll Phys & Elect Informat Engn, Wenzhou 325035, Peoples R China

[2] Southeast Univ, Natl Mobile Commun Res Lab, Nanjing 210096, Jiangsu, Peoples R China

[3] Guilin Univ Elect Technol, Sch Informat & Commun, Guilin 541004, Peoples R China

[4] Univ Sci & Technol Beijing, Ctr Convergence Networks & Ubiquitous Serv, Beijing Engn & Technol Res, Beijing 100083, Peoples R China

来源：

QUANTUM INFORMATION PROCESSING | 2017年 / 16卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Quantum secure communication; Quantum key distribution; Spatial multiplexing multiple-input multiple-out; Decoherence-free subspace; Orthogonal quantum states; INFORMATION; PRIVATE; COMMUNICATION; SECURITY; CAPACITY; CODES;

D O I：

10.1007/s11128-016-1474-x

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantum key distribution (QKD) system is presently being developed for providing high-security transmission in future free-space optical communication links. However, currentQKDtechnique restricts quantum secure communication to a lowbit rate. To improve theQKDbit rate, we propose a subcarrier multiplexing multiple-input multiple-output quantum key distribution (SCM-MQKD) scheme with orthogonal quantum states. Specifically, we firstly present SCM-MQKD system model and drive symmetrical SCM-MQKD system into decoherence-free subspaces. We then utilize bipartite Werner and isotropic states to construct multiple parallel single photon with orthogonal quantum states that are invariant for unitary operations. Finally, we derive the density matrix and the capacity of SCM-MQKD system, respectively. Theoretical analysis and numerical results show that the capacity of SCM-MQKD system will increase log(2)(N-2 + 1) times than that of single-photon QKD system.

引用

页数：18

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