基于不同介质间量子密钥分发的研究

摘要

This paper mainly solves the photon polarization encoding problem of quantum key distribution (QKD) between different media. The influence of the transmission rate of different photon component on quantum bit error rate (QBER) has been quantitatively analyzed, with a practical analysis of QBER of QKD between air and water. Furthermore, we have put forward a single-photon compensation scheme for eliminating such non-ideal BB84 protocol, as well as a more robust and practical dual-photon encoding scheme to offset such interfacial non-unitary noise. This takes an important step towards the air-sea-ground wide area quantum communication in the future.%文章主要解决了偏振编码的光子在不同介质间进行量子密钥分发的问题，定量地分析了光子不同分量的不同透过率引起的误码率问题，并实际分析了空气-水介质间量子密钥分发引起的误码率。进一步给出了可以消除这种非理想BB84协议的单光子补偿方案，以及可以采用更加鲁棒、实用性的抗界面非幺正噪声的双光子编码方案，从而为未来实现全地域广域量子通信迈出了重要的一步。