High-Dimensional Quantum Conference Key Agreement

TL;DR

This paper introduces a high-dimensional Quantum Conference Key Agreement protocol, proving its security against general attacks and demonstrating its advantages in various settings, advancing multi-party quantum cryptography.

Contribution

It presents a novel high-dimensional QCKA protocol with a rigorous security proof and practical evaluation, enhancing multi-party quantum cryptographic methods.

Findings

Protocol is secure against arbitrary attacks in finite-key scenarios

High-dimensional states significantly improve protocol performance

The proof technique can be applied to other quantum cryptographic protocols

Abstract

Quantum Conference Key Agreement (QCKA) protocols are designed to allow multiple parties to agree on a shared secret key, secure against computationally unbounded adversaries. In this paper, we consider a high-dimensional QCKA protocol and prove its information theoretic security against arbitrary, general, attacks in the finite-key scenario. Our proof technique may be useful for other high-dimensional multi-party quantum cryptographic protocols. Finally, we evaluate the protocol in a variety of settings, showing that high-dimensional states can greatly benefit QCKA protocols.