Quantum authentication using entangled state

TL;DR

This paper proposes a quantum authentication protocol using shared EPR pairs, local operations, and rotations, demonstrating security, reusability of sources, and robustness against eavesdroppers.

Contribution

It introduces a novel quantum authentication scheme leveraging entangled states, with security and reusability features not present in prior methods.

Findings

Secure against eavesdroppers with full control over channels

EPR sources are reusable in the protocol

Protocol is robust under various conditions

Abstract

A scheme of quantum authentication is presented. Two parties share Einstein-Podolsky-Rosen (EPR) pairs previously as the authentication key which servers as encoder and decoder. The authentication is accomplished with local controlled-NOT operations and unitary rotations. It is shown that our scheme is secure even in the presence of an eavesdropper who has complete control over both classical and quantum channels. Another character of this protocol is that the EPR sources are reusable. The robustness of this protocol is also discussed.