本文提出了一种基于纠缠交换的量子局域网络传输模型,结合传统通信网络的树形局域网模型,使用经典通信协议,并根据以太网IEEE8023一般帧格式设置一种帧格式用来承载建立量子信道的控制信息。用户间依靠该局域网模型通过纠缠交换协议以及经典信道辅助传递控制信息来控制用户间量子信道的建立与释放,实现端到端量子信息的传输。对该网络的吞吐率进行分析表明,当节点时延为1 μs,将传输过程中理想条件下的概率PSW、Pbel、Ptes设为08,则吞吐率随着网络中纠缠粒子生成概率Pbor增加而显著增加,最大为550 kb／s;将传输过程中理想条件下的概率Pbor、Pbel、Ptes设为08,吞吐率也随着网络中纠缠交换成功概率PSW的增加而增加,最大为450 kb／s;同时当节点时延每增加1 μs,相同条件下的网络吞吐率将下降50％。因此,在将来量子局域网设置中应尽量提升纠缠交换过程的成功率,同时优化信道,降低经典信道的时延以提高量子局域网中的的系统吞吐率。

The construction of quantum wide area network (QWAN) is an inevitable trend of quantum communication,and the foundation of building a stable QWAN lies in the structure and performance of local area network(LAN).In this paper,a quantum local area network transmission model based on entanglement swapping is proposed.This model combines the tree shaped LAN model of traditional communication networks,uses classical communication protocols and according to the Ethernet IEEE8023 general frame format,a frame format is set up to carry the control information for the establishment of quantum channel.The local area network model can control the establishment and release of quantum channel between users by means of entanglement swapping protocol and classical channel-assisted transmission control information,and realize the end-to-end transmission of quantum information.By analyzing the throughput of the network,it is shown that when the node delay is 1 microsecond and the probability of PSW,Pbel and Ptes is set to 08 under ideal conditions during transmission,the throughput increases significantly with the increase of the probability of entangled particle generation (Pbor)in the network,and the maximum is 550kb／s.The probability of Pbor Pbel and Ptesunder ideal conditions is set to 08,and the throughput increases with the increase of the probability of success of entanglement switching(PSW) in the network,the maximum of which is 450kb／s.When the node delay is increased by 1 microsecond,the throughput of the network will be reduced by 50％ under the same condition.Therefore,in the future,the success rate of entanglement switching should be increased as much as possible,and the channel should be optimized to reduce the delay of classical channel to improve the system throughput in quantum local area networks.