Zhang Chun-Hui, Zhang Chun-Mei, Guo Guang-Can, Wang Qin
Opt Express. 2018 Feb 19;26(4):4219-4229. doi: 10.1364/OE.26.004219.
At present, most of the measurement-device-independent quantum key distributions (MDI-QKD) are based on weak coherent sources and limited in the transmission distance under realistic experimental conditions, e.g., considering the finite-size-key effects. Hence in this paper, we propose a new biased decoy-state scheme using heralded single-photon sources for the three-intensity MDI-QKD, where we prepare the decoy pulses only in X basis and adopt both the collective constraints and joint parameter estimation techniques. Compared with former schemes with WCS or HSPS, after implementing full parameter optimizations, our scheme gives distinct reduced quantum bit error rate in the X basis and thus show excellent performance, especially when the data size is relatively small.
目前，大多数与测量设备无关的量子密钥分发（MDI-QKD）基于弱相干源，并且在实际实验条件下（例如考虑有限尺寸密钥效应时）传输距离受限。因此，在本文中，我们针对三强度MDI-QKD提出了一种使用预示单光子源的新型偏置诱骗态方案，其中我们仅在X基下制备诱骗脉冲，并采用集体约束和联合参数估计技术。与以前使用弱相干源（WCS）或 heralded 单光子源（HSPS）的方案相比，在实施全面参数优化后，我们的方案在X基下给出了明显降低的量子误码率，从而表现出优异的性能，尤其是在数据量相对较小时。
