Capacity of multiple-input-multiple-output quantum key distribution channels
Hailin Xiao, Ouyang Shan, Nie Zaiping, (1)电子科技大学电子工程学院，成都 610054; (2)桂林电子科技大学信息与通信学院，桂林 541004 · Acta Physica Sinica · 2009
Quantum safety communications is a process of quantum key distribution （QKD）. Current QKD technology restricts transmission to a low bit rate. To improve the QKD bit rate and develope high rate and large capacity, we propose a multiple-input-multiple-output（MIMO） quantum key distribution system. The Wigner operator of multi-photon entangled states in MIMO quantum key distribution channel is presented. As a result, the Wigner function of multi-photon double-model squeezed entangled sates and MIMO quantum key distribution channel capacity are also obtained, which will provide theoretical support and technical basis for developing robust space-time processing algorithm of MIMO quantum safety communications and designing optimum high performance system of MIMO quantum key distribution.