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利用线性光学器件,在实验上演示了大气空间中的2.2m距离的量子密钥分配的B92方案物理原理.实验中用高度衰减的650nm弱脉冲激光光源作为单光子源.量子密码通讯的优点是它的安全性.在实验中清楚地演示出窃听者的窃听行为对通讯的信号产生明显影响,从而被发现.最后,对实用量子密码通讯所存在的问题及其解决方案进行了讨论.指出提高量子密码通讯的距离在于克服传输中的衰减.这个问题的解决需要新的量子密码通讯协议.
Using the linear optics, we experimentally demonstrated the physical principle of quantum key distribution of 2.2m in the atmospheric space based on the B92 scheme. A highly attenuated 650nm weak pulsed laser source was used as the single photon source in the experiment. The advantage of quantum cryptography Its security is clearly demonstrated in the experiments that eavesdroppers’ eavesdropper behavior has a significant influence on the signal of communication, so that it is discovered.Finally, the problems and solutions of practical quantum cryptography communication are discussed, The distance between quantum cryptography and communication is to overcome the attenuation in transmission.This problem is solved by the new quantum cryptography protocol.