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基于相位编码的量子密钥分发系统需要对信息加载的相位调制器的半波电压进行精确的测定以减小量子密钥的误码率,相位调制器半波电压的测量精度直接影响到了量子密钥分发系统的最终误码.本文提出了一种基于确定性量子密钥分发误码率判据的相位调制器半波电压的精确测定方法,所采用相位调制器的半波电压的测量精度达到了2mV,实验结果表明这种方法可以用于量子密钥分发实际应用系统中实时获得不同条件下的行波相位调制器的半波电压以最大程度地减小由于相位信息不准确加载而带来的系统误码.
The quantum key distribution system based on phase encoding needs to accurately measure the half-wave voltage of the phase modulator for information loading to reduce the error rate of the quantum key. The measurement accuracy of the half-wave voltage of the phase modulator directly affects the quantum density Key distribution system of the final error.This paper presents a deterministic quantum key distribution based on the error rate of the phase modulator half-wave voltage measurement method, the use of phase modulator half-wave voltage measurement accuracy 2mV. Experimental results show that this method can be used in real-time applications of quantum key distribution to obtain half-wave voltage of traveling-wave phase modulator in different conditions in real time to minimize the inaccurate loading of phase information System error code.