Quantum secure identification using entanglement and catalysis

TL;DR

This paper explores a quantum identification protocol leveraging entanglement and catalysis, proposing a reusable entangled token for authentication and analyzing optimal state approximations under local operations and classical communication.

Contribution

It introduces a novel quantum identification method using entanglement catalysis and studies the optimal approximation of entangled states with local actions.

Findings

Proposes a reusable entangled authentication token.

Analyzes the best approximation of pure entangled states.

Highlights the role of entanglement catalysis in secure identification.

Abstract

I consider the use of entanglement between two parties to enable one to authenticate her identity to another over a quantum communication channel. Exploiting the phenomenon of entanglement-catalyzed transformations between pure states gives a potentially reusable entangled identification token. In analyzing this, I consider the independently interesting problem of the best possible approximation to a given pure entangled state realizable using local actions and classical communication by parties sharing a different entangled state.