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Q: Fachverband Quantenoptik und Photonik

Q 59: QuanTour V – Protocols

Q 59.4: Talk

Thursday, March 5, 2026, 15:30–15:45, P 7

Experimental Quantum Strong Coin Flipping - An Application of QTorch — •Koray Kaymazlar¹, Daniel Vajner¹, Fenja Drauschke², Lucas Rickert¹, Martin von Helversen¹, Shulun Li³, Zhichuan Niu³, Anna Pappa², and Tobias Heindel⁴ — ¹Institute of Physics and Astronomy, Technische Univeristät Berlin, Germany — ²Electrical Engineering and Computer Science Department, Technische Univeristät Berlin, Germany — ³Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China — ⁴Department for Quantum Technology, University of Münster, Germany

Strong coin flipping is a fundamental cryptographic protocol allowing two distrustful parties to agree on randomly generated bits. We report the first implementation of a quantum strong coin flipping using single photons and demonstrate a quantum advantage compared to both classical protocols and implementations using weak coherent pulses [1]. The quantum advantage is enabled by employing a state-of-the-art deterministic single-photon source from the same family of the one used in QuanTour outreach project based on a quantum dot embedded in a high-Purcell microcavity. Our QSCF implementation, operating at an 80 MHz clock-rate enables a coin flipping rate of 1.5 kHz and an average QBER below 3%, sufficient to realize a quantum advantage. [1] D. A. Vajner, K. Kaymazlar, F. Drauschke, L. Rickert, M. von Helversen, H. Liu, S. Li, H. Ni, Z. Niu, A. Pappa, T. Heindel, Single-Photon Advantage in Quantum Cryptography Beyond QKD, arXiv:2412.14993 (2024)

Keywords: Quantum Dot; Single Photons; Quantum Advantage; QuanTour