Wiesner Quantum Money: Difference between revisions

The classical money scheme involves the Bank distributing notes to the untrusted users. Each note has a unique serial number attached to it and this number provides a basis for the verification of the note when the user wants to use it for transaction. However in the classical world, nothing prevents a user with sufficient resources to be able to forge the note and create more notes than what he originally had in possession. In the 1980s, Wiesner proposed the idea of quantum money to create unforgeable bank notes. The unforgeability of the note relied on the no-cloning property of quantum mechanics. In the Wiesner scheme, the bank notes are several

BB84 states prepared by the Bank, who then distributes them to the untrusted users. When the user needs to carry out a transaction with his note, he sends it to the Bank for verification, who then authenticates the validity of the note. Based on the no-cloning property of quantum mechanics, Wiesner showed an information theoretic security against a note forger.