Secure quantum key distribution network with Bell states and local unitary operations

TL;DR

This paper presents a theoretical quantum key distribution network scheme leveraging Bell states and local unitary operations, achieving high capacity and efficiency while preventing eavesdropping through decoy particles.

Contribution

It introduces a novel secure quantum key distribution network scheme that combines quantum dense coding with decoy particles to enhance security and efficiency.

Findings

High information capacity with one particle carrying two bits

Approaches 100% efficiency for qubits

No need for users to store quantum states

Abstract

We propose a theoretical scheme for secure quantum key distribution network following the ideas in quantum dense coding. In this scheme, the server of the network provides the service for preparing and measuring the Bell states, and the users encodes the states with local unitary operations. For preventing the server from eavesdropping, we design a decoy when the particle is transmitted between the users. It has high capacity as one particle carries two bits of information and its efficiency for qubits approaches 100%. Moreover, it is not necessary for the users to store the quantum states, which makes this scheme more convenient for application than others.