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THU: Thursday Contributed Sessions
THU 5: QIP Implementations: Interfaces
THU 5.7: Talk
Thursday, September 11, 2025, 15:45–16:00, ZHG006
Color centers for the secure processing of quantum tokens — •Gregor Pieplow1, Yannick Strocka1, Mohamed Belhassen1, and Tim Schröder1,2 — 1Humboldt-Universität zu Berlin, Berlin, Germany — 2Ferdinand-Braun-Institut, Berlin, Germany
We present a quantum token scheme [1] for secure authentication or payment. Building on Wiesner’s quantum money concept, tokens are encoded as multi-qubit states generated by a single-photon source, then transmitted and securely stored in a quantum-memory register. To manipulate and verify the token, we employ a sawfish nanophotonic-crystal cavity as a spin-photon interface, enabling the required spin-photon entangling gates. High-fidelity fractional quantum gates are realized via trains of optical π/8 pulses, achieving fidelities above 99% under realistic conditions. Although all-optical methods yield superior rates, limited storage times may constrain some applications. Incorporating microwave control, and leveraging long-lived nuclear spins extends token viability but lowers operational rates, highlighting a key trade-off for practical deployment.
[1] Strocka et al., arXiv:2503.04985 (2025)