Limited Resource Semi-Quantum Key Distribution

TL;DR

This paper introduces a semi-quantum key distribution protocol where both users have limited quantum capabilities, demonstrating security and noise tolerance comparable to fully quantum protocols.

Contribution

It presents a novel SQKD protocol with a quantum user limited in measurement, along with security proof and noise tolerance analysis.

Findings

Protocol is secure against powerful adversaries

Noise tolerance matches fully quantum QKD protocols

Both users have limited quantum capabilities

Abstract

A semi-quantum key distribution (SQKD) protocol allows a quantum user and a limited "classical" user to establish a shared secret key secure against an all-powerful adversary. In this work, we present a new SQKD protocol where the quantum user is also limited in her measurement capabilities. We describe the protocol, prove its security, and show its noise tolerance is as high as "fully quantum" QKD protocols.