Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Communication II
Q 12.1: Vortrag
Montag, 11. März 2024, 17:00–17:15, HS 3118
Ensemble based quantum protocol for ultra save quantum money — •Bernd Bauerhenne1, Malwin Xibraku1, Boris Naydenov2, Cyril Popov1, Martin Garcia1, and Kilian Singer1 — 1Universität Kassel, Heinrich-Plett Straße 40, 34132 Kassel — 2Helmholtz-Zentrum Berlin
We present a ensemble based quantum token protocol [1,2] that can detect counterfeiting by analysing the measurement noise. A quantum token consists now of identical qubits. Each quantum token is prepared by a bank by writing all qubits into the same state. The angles are kept secret. Multiple ensemble-based quantum tokens will have different secret states. During verification, the bank measures the qubits of the quantum token with the secret angles and if more than a given critical number of qubits are projected into the ground state, the quantum token is accepted. If from the set of quantum tokens more than a given number of quantum token is accepted, the whole set is accepted. We discuss how big the probability is that the bank accepts the counterfeit tokens. We show how resources must be scaled such that the probability that the bank accepts a counterfeit token set becomes arbitrary small.
[1] https://www.forschung-it-sicherheit-kommunikationssysteme.de/projekte/diqtok [2] K. Singer, C. Popov, B. Naydenov, Verfahren zum Erstellen eines Quanten-Datentokens (DE 10 2022 107 528 A1) DE-Patent (2023)
Keywords: quantum token; quantum protocol; quantum money; qubit ensemble