Entangled Quantum Walkers for Secure Quantum Key Distribution

TL;DR

This paper introduces a novel quantum key distribution protocol utilizing entangled quantum walkers, leveraging their unique correlations and probability distributions to enhance security in quantum communication.

Contribution

It proposes a new QKD protocol based on entangled quantum walkers, combining quantum walk phenomena with cryptographic security features.

Findings

Protocol exploits correlations at extremal positions of quantum walkers.

Security analysis based on joint probability distributions of walkers' positions.

Demonstrates potential for secure quantum communication using entangled quantum walks.

Abstract

Quantum Key Distribution (QKD) is an emerging cryptographic method designed for secure key sharing. Its security is theoretically guaranteed by fundamental principles of quantum mechanics, making it a leading candidate for future communication protocols. Quantum Random Walks (QRWs), on the other hand, are quantum processes that exhibit intriguing phenomena such as interference and superposition, enabling the generation of decentralized and asymmetric probability distributions. Inspired by both fields of study, we propose a novel QKD protocol based on two entangled quantum walkers. Our protocol exploits the unique correlations between the walkers at extremal positions of the walk to establish secret keys shared exclusively by the two parties. The security of the protocol is augmented by analyzing the joint probability distributions of the walkers' measured positions and their associated coin states.