Fully connected entanglement-based quantum communication network without trusted node

TL;DR

This paper proposes a scalable, fully connected quantum communication network for many users using broadband entangled photon sources, eliminating the need for trusted nodes and enabling secure, efficient communication in real-world scenarios.

Contribution

It introduces a novel architecture for large-scale quantum networks that is fully connected, scalable, and does not require trusted nodes, utilizing wavelength and space multiplexing technologies.

Findings

40 users fully connected simultaneously

No trusted node required for secure communication

High efficiency and scalability demonstrated

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.