Extensible router for multi-user quantum key distribution network

TL;DR

This paper proposes an extensible quantum router for multi-user QKD networks that uses wavelength routing to efficiently and securely distribute quantum keys without destroying quantum states, enabling scalable star-network configurations.

Contribution

It introduces a quantum router based on wavelength division multiplexers that can route quantum signals in a multi-user QKD network, enhancing scalability and practicality.

Findings

Quantum router can route signals without destroying quantum states.

The scheme supports a scalable star-network topology.

Feasibility and simplicity of the approach are demonstrated.

Abstract

A feasible quantum key distribution (QKD) network scheme has been proposed with the wavelength routing. An apparatus called "quantum router", which is made up of many wavelength division multiplexers, can route the quantum signals without destroying their quantum states. Combining with existing point-to-point QKD technology, we can setup a perfectly QKD star-network. A simple characteristic and feasibility of this scheme has also been obtained.