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Wiesner Quantum Money
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==Protocol Description== '''Input''': Product state of <math>N</math> qubit and a serial number</br> '''Output''': approved/rejected </br> '''Stage 1: Preparation''' # The Mint generate a quantum money composed of two component <math>(|S\rangle,k)</math> where <math>k</math> is the serial number of the banknote and <math>S</math> is a product state of <math>N</math> qubits. Each qubit is randomly chosen from the set <math>\{|0\rangle,|1\rangle,|+\rangle,|-\rangle\}</math> # Serial numbers and their states are recorded and kept at the Mint '''Stage 2: Verification''' # The Mint looks for the serial number and the corresponding measurement basis in its database. Thus, each qubit is measured in the right basis,<math>\{|0\rangle,|1\rangle\}</math> or <math>\{|+\rangle,|-\rangle\}</math>. # The Mint outputs 1 if the result of the measurement corresponds with the data stored in its database, otherwise it returns 0.
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