【摘要】 与单光子量子密钥分配采用单光子探测器不同,连续变量量子密钥分配采用平衡零拍测量技术.分析了由于参考光的真空噪声、分束器的透射率和反射率不相等引入的平衡零拍测量误差,以及平衡零拍测量探测器的电子噪声对连续变量量子密钥传输的最大安全距离的限制,给出了平衡零拍测量的探测噪声、电子噪声和密钥量之间的定量表达式.更多还原

【Abstract】 Different from single photon quantum key distribution, continuous variable quantum key distribution uses the balanced homodyne detection. In this paper, the detection error of balanced homodyne caused by vacuum noise of the local light and unbalance of beam splitter is analyzed, the maximal safe distance limited by the electronic noise of balance homodyne detector is given, finally, the relationship between the noise of balanced homodyne detection and key rate are shown.更多还原