Continuous-variable measurement-device-independent multipartite quantum communication

TL;DR

This paper proposes a continuous-variable measurement-device-independent multi-party quantum communication protocol that enhances security and functionality using distributed entangled states, analyzing its robustness against various attacks.

Contribution

It introduces a novel multi-party quantum communication protocol based on continuous variables and distributed GHZ states, with comprehensive security analysis against entangling and coherent attacks.

Findings

Coherent attacks significantly reduce the secret key rate.

The protocol supports quantum cryptographic conference and secret sharing.

Optimal attack strategies are identified and compared.

Abstract

A continuous variable measurement device independent multi-party quantum communication protocol is investigated in this paper. Utilizing distributed continuous variable Greenberger-Horne-Zeilinger state, this protocol can implement both quantum cryptographic conference and quantum secret sharing. We analyze the security of the protocol against both entangling cloner attack and coherent attack. Entangling cloner attack is a practical individual attack, and coherent attack is the optimal attack Eve can implement. Simulation results show that coherent attack can greatly reduce the secret key rate. Different kinds of entangled attacks are compared and we finally discuss the optimal coherent attacks.