Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 47: Focus Session: Quantum Technologies in Deployed Systems II
HL 47.6: Vortrag
Donnerstag, 20. März 2025, 12:00–12:15, H17
Experimental Quantum Strong Coin Flipping using a Deterministic Single-Photon Source — Daniel Vajner1, •Koray Kaymazlar1, Fenja Drauschke2, Lucas Rickert1, Martin von Helversen1, Shulun Li3, Zhichuan Niu3, Anna Pappa2,4, and Tobias Heindel1 — 1Institute of Solid State Physics, Technische Univeristät Berlin, Germany — 2Electrical Engineering and Computer Science Department, Technische Univeristät Berlin, Germany — 3Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China — 4Fraunhofer Institute for Open Communication Systems - FOKUS, Technical University Berlin, Germany
Strong coin flipping (SCF) is a fundamental cryptographic protocol allowing two distrustful parties to agree on randomly generated bit. In this work, we report the first implementation of a quantum strong coin flipping protocol that yields a quantum advantage compared to both its classical counterpart and an implementation using weak coherent pulses.
The quantum advantage is enabled by employing a state-of-the-art deterministic single-photon source based on a quantum dot embedded in a high-Purcell microcavity. Using a fiber-based electro-optic modulator (EOM) in single-pass configuration in combination with a self-built arbitrary waveform generator we realize fast dynamic, random polarization-state encoding at 80 MHz clock-rate.
Our QSCF implementation enables a coin flipping rate of 1.5 kHz and an average quantum bit error ratio (QBER) below 3%, sufficient to realize a quantum advantage.
Keywords: Coin Flipping Protocol; Quantum Dot; Quantum Advantage; Quantum Cryptography