Semiquantum key distribution using entangled states

TL;DR

This paper introduces a semiquantum key distribution protocol utilizing entangled states, enabling a quantum Alice to securely share a key with a classical Bob, and demonstrates its security against eavesdropping.

Contribution

It presents a novel semiquantum key distribution protocol based on entangled states, expanding the scope of quantum cryptography with classical participants.

Findings

Protocol is secure against eavesdropping

Uses entangled states for key sharing

Enables classical Bob to participate securely

Abstract

Recently, Boyer et al. presented a novel semiquantum key distribution protocol [M. Boyer, D. Kenigsberg, and T. Mor, Phys. Rev. Lett. 99, 140501 (2007)], by using four quantum states, each of which is randomly prepared by Z basis or X basis. Here we present a semiquantum key distribution protocol by using entangled states in which quantum Alice shares a secret key with classical Bob. We also show the protocol is secure against eavesdropping.