Jo Yonggi, Park Hee Su, Lee Seung-Woo, Son Wonmin
Department of Physics, Sogang University, Seoul 04107, Korea.
Research Institute for Basic Science, Sogang University, Seoul 04107, Korea.
Entropy (Basel). 2019 Jan 17;21(1):80. doi: 10.3390/e21010080.
We propose a schematic setup of quantum key distribution (QKD) with an improved secret key rate based on high-dimensional quantum states. Two degrees-of-freedom of a single photon, orbital angular momentum modes, and multi-path modes, are used to encode secret key information. Its practical implementation consists of optical elements that are within the reach of current technologies such as a multiport interferometer. We show that the proposed feasible protocol has improved the secret key rate with much sophistication compared to the previous 2-dimensional protocol known as the detector-device-independent QKD.
我们提出了一种基于高维量子态的量子密钥分发（QKD）的示意性设置，其具有改进的密钥率。利用单光子的两个自由度，即轨道角动量模式和多路径模式，来编码密钥信息。其实际实现由当前技术可及的光学元件组成，如多端口干涉仪。我们表明，与先前称为探测器无关设备的量子密钥分发的二维协议相比，所提出的可行协议在复杂度更高的情况下提高了密钥率。
