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Quantum Money: Difference between revisions
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== Outline == | == Outline == | ||
Assume a TTP (eg. a bank), a verifier (eg. a merchant) and a prover (eg. a client) are involved in a quantum money scheme. Also, assume there is only one circulating quantum coin. They follow the following procedure:</br> | Assume a TTP (eg. a bank), a verifier (eg. a merchant) and a prover (eg. a client) are involved in a quantum money scheme. Also, assume there is only one circulating quantum coin. They follow the following procedure:</br> | ||
* ''Preparation'': TTP prepares n qubits for each quantum coin with a serial number S. It stores the classical information about the qubits corresponding to S in a database and handover the quantum coin to a prover. | * '''Preparation''': TTP prepares n qubits for each quantum coin with a serial number S. It stores the classical information about the qubits corresponding to S in a database and handover the quantum coin to a prover. | ||
* ''Interaction'': In this step, the prover wants to transfer the quantum coin to a verifier. So, the authenticity of the quantum coin shall be verified by the verifier. To this end, the verifier sends a challenge to the prover and gets the serial number $SN$ of the quantum coin and the prepared qubits for it. | * '''Interaction''': In this step, the prover wants to transfer the quantum coin to a verifier. So, the authenticity of the quantum coin shall be verified by the verifier. To this end, the verifier sends a challenge to the prover and gets the serial number $SN$ of the quantum coin and the prepared qubits for it. | ||
* ''Transaction'': The verifier accepts the coin if the received qubits corresponds to the stored information in the database regarding the serial number and classical information of the quantum coin. If the verifier can do the verification process by his own, the quantum money scheme is called public quantum money. Otherwise, if he needs to communicate with the TTP to verify the quantum coin, the scheme is called private quantum money. | * '''Transaction''': The verifier accepts the coin if the received qubits corresponds to the stored information in the database regarding the serial number and classical information of the quantum coin. If the verifier can do the verification process by his own, the quantum money scheme is called public quantum money. Otherwise, if he needs to communicate with the TTP to verify the quantum coin, the scheme is called private quantum money. | ||