Fully Connected Entanglement-based Quantum Communication Network without Trusted Node

Abstract

Quantum communication is developed owing to the theoretically proven security of quantum mechanics, which may become the main technique in future information security. However, most studies and implementations are limited to two or several parties. Herein, we propose a fully connected quantum communication network without a trusted node for a large number of users. Using flexible wavelength demultiplex/multiplex and space multiplex technologies, 40 users are fully connected simultaneously without a trusted node by a broadband energy-time entangled photon pair source. This network architecture may be widely deployed in real scenarios such as companies, schools, and communities owing to its simplicity, scalability, and high efficiency.

A study of polarization compensation for quantum networks

“…Lately, significant efforts have been made in the implementation of QKD in networks in which each user is connected with all other users at the same time [15][16][17]. One common way to create such a full-mesh network is wavelength multiplexing which allows expanding the bandwidth capacity of the network without the need for additional fibres [9].…”