主要介绍了量子光源，尤其是指示单光子源在量子密钥分配(QKD)中的应用，提出了一种新的基于指示单光子源的不依赖于测量装置的量子密钥分配(MDI-QKD)方案。与现有的其他方案，如弱相干态方案相比，该方案具有安全性好，密钥提取率与安全传输距离都显著提高等优点。因而，该方案在未来的量子密钥分配实用化进程中具有广阔的发展前景。

Applications of quantum sources, especially the heralded single photon source in the quantum key distribution (QKD) are introduced, and a new scheme of the measurement-device-independent quantum key distribution (MDI-QKD) based on heralded single photon source is presented. Comparing with existing schemes, such as the scheme of using weak coherent sources, the new scheme has many advantages like a better security, a higher key generation rate and a longer safe transmission distance. Therefore, it seems to be a promising candidate for the implementation for the quantum key distribution in the near future.