The decoy-state method substantially improves the performance of quantum key distribution (QKD) and perfectly solves crucial issues caused by multiphoton pulses. In recent years, the decoy-state method has occupied a key position in practicality, and almost all the QKD systems have employed the decoy-state method. However, the imperfections of traditional intensity modulators limit the performance of the decoy-state method and bring side channels. In this work, a special intensity modulator and its accompanying modulation method are designed and experimentally verified for the secure, stable, and high-performance decoy-state QKDs. The experimental result indicates that its stable and adjustable intensities, convenient two-level modulation, inherently high speed, and compact structure is extremely fit for future trends and will help the decoy-state method to be perfectly applied to QKD systems.

诱饵态方法大大提高了量子密钥分配（QKD）的性能，并完美解决了由多光子脉冲引起的关键问题。近年来，诱饵状态法在实用中占据着关键位置，几乎所有的QKD系统都采用了诱饵状态法。但是，传统强度调制器的不完善之处限制了诱饵态方法的性能，并带来了旁通道。在这项工作中，为安全，稳定和高性能的诱饵态QKD设计并实验验证了一种特殊的强度调制器及其随附的调制方法。实验结果表明，其强度稳定，可调，方便的两级调制，固有的高速度，