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QI: Fachverband Quanteninformation
QI 26: Quantum Communication I: Theory
QI 26.5: Vortrag
Donnerstag, 13. März 2025, 12:15–12:30, HS IX
Security of an ensemble based quantum token against optimized atacks — •Bernd Bauerhenne1, Lucas Tsunaki2, Malwin Xibraku1, Boris Naydenov2, Martin Garcia1, and Kilian Singer1 — 1Department of Physics, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany — 2Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
We introduce quantum coins, which are composed of discrete quantum tokens, each containing an ensemble of identical qubits. These quantum coins are initialized by a banking entity that encodes a unique, secret quantum state into each token by aligning all qubits in a token to a uniform state. The integrity of the coin is subsequently verified through sequential assessments of these quantum tokens. During this verification process, the bank executes measurements on the qubits using the known secret angles from the initialization. A quantum token is deemed valid if a critical threshold number of its qubits are measured in the ground state. A coin is considered authentic and accepted if it contains a sufficient number of validated tokens.
Our discussion also explores potential vulnerabilities to forgery, examining scenarios wherein a malicious actor attempts to replicate the quantum coins. We present a detailed analysis of various attack strategies and demonstrate that, even with optimized methods, the probability of such counterfeit coins being accepted by the bank is negligibly small. This analysis not only emphasizes the robustness of our proposed quantum coin system against duplication attempts but also enhances its application potential in secure quantum currency systems.
Keywords: quantum coin; quatum token; security of coins; ensembles of qubits