qBitcoin: A Peer-to-Peer Quantum Cash System

Abstract

A decentralized online quantum cash system, called qBitcoin, is given. We design the system which has great benefits of quantization in the following sense. Firstly, quantum teleportation technology is used for coin transaction, which prevents from the owner of the coin keeping the original coin data even after sending the coin to another. This was a main problem in a classical circuit and a blockchain was introduced to solve this issue. In qBitcoin, the double-spending problem never happens and its security is guaranteed theoretically by virtue of quantum information theory. Making a block is time consuming and the system of qBitcoin is based on a quantum chain, instead of blocks. Therefore a payment can be completed much faster than Bitcoin. Moreover we employ quantum digital signature so that it naturally inherits properties of peer-to-peer (P2P) cash system as originally proposed in Bitcoin.

11 pages, 2 figures

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• The Quantum Internet
• Experimental quantum teleportation
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• Fundamental rate-loss tradeoff for the quantum internet
• Versatile relative entropy bounds for quantum networks

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• Quantum Protocol for Decision Making and Verifying Truthfulness among $N$-quantum Parties: Solution and Extension of the Quantum Coin Flipping Game
• Semi-Device Independent Quantum Money
• Energy efficient mining on a quantum-enabled blockchain using light
• Quantum interactive proofs using quantum energy teleportation