Tripartite Counterfactual Quantum Cryptography

TL;DR

This paper introduces a counterfactual quantum cryptography protocol enabling two distrustful parties to share a secret key with a trusted third party without any information-carrying particles traveling between them.

Contribution

It presents a novel tripartite counterfactual quantum cryptography scheme that enhances security by eliminating particle transmission between parties.

Findings

Secure key sharing without particle transmission

Counterfactual communication demonstrated among three parties

Potential for improved quantum cryptography protocols

Abstract

We show how two distrustful parties, "Bob" and "Charlie", can share a secret key with the help of a mutually trusted "Alice", counterfactually - that is with no information-carrying particles travelling between any of the three parties.