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

2025-02-25

AI Summary

Existing offline digital currency systems face double-spending risks, often necessitating transaction amount caps that undermine financial inclusion. This paper proposes a semi-quantum token–based offline secure digital currency system—the first to leverage quantum no-cloning to achieve trustless offline double-spending prevention. It integrates lightweight blockchain smart contracts with semi-quantum key distribution to support multi-channel transactions and cross-currency atomic swaps. Experimental results demonstrate unconditional support for arbitrary-value offline transfers, achieving 120 transactions per second (TPS) throughput and end-to-end latency under 800 ms. Critically, the system eliminates double-spending risk entirely while significantly enhancing both security and inclusivity in offline environments.

Technology Category

• Machine Learning: Quantum Machine Learning
• Multiagent Systems: Mechanism Design
• Search and Optimization: Distributed Search

Application Category

• Security and Privacy: Cryptocurrency and smart contracts
• Economics, Online Markets and Human Computation: Economic aspects of blockchain and cryptocurrencies
• Systems and Infrastructure for Web, Mobile and WoT: Decentralized Web and Fediverse systems

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.

Problem

• Secure offline digital currency transactions
• Prevent double-spending using quantum principles
• Integrate blockchain for credit risk mitigation

Innovation

• Quantum-state-based currency system
• Non-cloning theorem security
• Blockchain-integrated credit risk mitigation