A simple unconditionally secure quantum bit commitment protocol via quantum teleportation

TL;DR

This paper introduces a straightforward quantum bit commitment protocol leveraging quantum teleportation, achieving unconditional security by circumventing traditional impossibility proofs through unique measurement procedures.

Contribution

It presents a novel quantum bit commitment protocol based on local teleportation that is unconditionally secure and not covered by existing impossibility proofs.

Findings

Protocol achieves unconditional security.

Uses only classical evidence for commitment.

Circumvents traditional impossibility proofs.

Abstract

By using local quantum teleportation of a fixed state to one qubit of an entangled pair sent from the other party, it is shown how one party can commit a bit with only classical information as evidence that results in an unconditionally secure protocol. The well-known ``impossibility proof'' does not cover such protocols due to its different commitment and opening prescriptions, which necessitate actual quantum measurements among different possible systems that cannot be entangled as a consequence.