Multi-Channel Currency: A Secure Method Using Semi-Quantum Tokens

TL;DR

This paper introduces a quantum-state-based digital currency system that enables secure offline multi-channel transactions without double-spending risks, integrating blockchain to enhance security and practical applicability.

Contribution

It presents a novel quantum currency system leveraging the non-cloning theorem for secure offline transactions, including experimental validation and blockchain integration.

Findings

Successful experimental implementation of quantum currency transfers

Demonstration of secure multi-channel transactions without double-spending

Integration of blockchain to reduce credit risks in currency swaps

Abstract

Digital currencies primarily operate online, but there is growing interest in enabling offline transactions to improve digital inclusion. Existing offline methods struggle with double-spending risks, often limiting transaction amounts. In this work, we propose a quantum-state-based currency system that uses the non-cloning theorem to enable secure, multi-channel transactions without the risk of double spending. We demonstrate this system's implementation with experimental results, including use cases for currency transfers and swaps. To mitigate credit risks in swaps, we also integrate blockchain to show its wide applicability. Our approach paves the way for quantum-secure digital currencies and opens new possibilities for optimizing multi-channel tokens.