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Conference on Lasers and Electro-Optics

A High Dimensional Entanglement-based Fully Connected Quantum Key Distribution Network over 100 Users

Xu Liu, Rong Xue, Xin Yao, Heqing Wang, Hao Li, Lixing You, Yidong Huang, Wei Zhang

Published Jan 1, 2020• 0 citations
Publisher

Abstract

A high-dimensional entanglement-based fully connected quantum key distribution network is proposed and demonstrated experimentally over 100 users, where a broadband entanglement photon pair source is shared by end users via wavelength and space division multiplexing.
DOI
10.1364/cleo_at.2020.jtu2a.17

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Quantum key distribution (QKD) is a crucial technology for information security in the future. Developing simple and efficient ways to establish QKD among multiple users is important to extend the applications of QKD in communication networks. Herein, we proposed a scheme of symmetric dispersive optics QKD and demonstrated an entanglement-based quantum network based on it. In the experiment, a broadband entangled photon pair source was shared by end users via wavelength and space division multiplexing. The wide spectrum of generated entangled photon pairs was divided into 16 combinations of frequency-conjugate channels. Photon pairs in each channel combination supported a fully connected subnet with eight users by a passive beam splitter. Eventually, it showed that an entanglement-based QKD network over 100 users could be supported by one entangled photon pair source in this architecture. It has great potential on applications of local quantum networks with large user number.
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