介绍了一种基于单光子探测器的激光通信方法，发送端利用光子的4种偏振态对信息进行编码，经过量子信道进行传输后，在接收端通过4个偏振相关的单光子探测器的响应情况对信息进行判决输出。仿真结果表明系统的暗计数对信道容量的影响很小，而发送端的平均光子数是影响系统的通信性能的关键因素，信道容量最大可达到1．77 bit／码元。采用偏振相关的单光子探测技术进行激光通信，可以有效地提高系统的能量利用率，并降低噪声对通信性能的影响。%We introduce a new scheme based on single photon detectors for laser communication , where the sending terminal uses four polarization states of photons to code information via the transmission of quantum channel , and the receiving terminal decodes the information according to the responses of the four polarization -related single photon detectors .Simulation results show that the system's dark counts have little impact on the channel capacity , while the average photon numbers are the key factor to the system 's performance .The channel capacity can be up to a maximum of 1.77 bit per symbol .Using the polarization -dependent single photon de-tection technology for laser communication can effectively improve the system 's energy utilization and reduce the effect of noise on the communication .
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