Concurrent quantum key distribution using quantum teleportation and time division multiplexing

Xie Wu¹, Ouyang Shan^1,2, Hailin Xiao²

¹School of Electronic Engineering, Xidian University, 710071, Xi’an, China
²School of Information and Communication, Guilin University of Electronic Technology, 541004, Guilin, China

In view of the problem that it is difficult to use only one typical channel to deal with many quantum channels during multi-channel QKD (Quantum Key Distribution), the method of TDM (Time Division Multiplexing) in typical channel is introduced to construct a new CQKD (concurrent QKD) system. Using multi-channel quantum teleportation, every concurrent quantum channel is mapped to a time slot of TDM. The results of case study with EPR (Einstein-Podolsky-Rosen) pairs show that this problem can be solved with the CQKD methods. Moreover, this CQKD scheme also has the advantage of unconditional security, while the QKD bit rates can be improved. It opens a new way to develop large-capacity long-distance quantum secure communications.