Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 19: Quantum Networks, Repeaters, and QKD II (joint session Q/QI)
Q 19.4: Vortrag
Dienstag, 11. März 2025, 11:45–12:00, AP-HS
Single-Shot Readout and Coherent Control of a GeV-13C System for a Multi-Qubit Quantum Repeater Node — •Prithvi Gundlapalli1, Katharina Senkalla1, Philipp J. Vetter1, Nick Grimm1, Jurek Frey2,3, Tommaso Calarco4,5,6, Genko Genov1, Matthias M. Müller4, and Fedor Jelezko1 — 1Institute for Quantum Optics, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany — 2Peter Grünberg Institute-Quantum Computing Analytics (PGI-12), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany — 3Theoretical Physics, Saarland University, D-66123 Saarbrücken, Germany — 4Peter Grünberg Institute-Quantum Control (PGI-8), Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany — 5Institute for Theoretical Physics, University of Cologne, D-50937 Germany — 6Dipartimento di Fisica e Astronomia, Università di Bologna, 40127 Bologna, Italy
Quantum repeater nodes with efficient spin-photon interfaces and long-lived quantum memories are key to enabling practical quantum networks. We present our results on high-fidelity single-shot readout exceeding 90 % on the germanium-vacancy center in diamond and discuss the implementation of a real-time ‘blink check’ to improve the fidelity. We further present the efficient characterization of a proximal 13C using pulsed optically detected magnetic resonance and correlation spectroscopy and discuss optimization of its coherent control. Leveraging the long coherence times exceeding 20 ms and 2.5 s of the germanium-vacancy and 13C respectively, this work highlights the potential of this system as an efficient multi-qubit quantum repeater node.
Keywords: Quantum Repeater; Single-Shot Readout; Coherent Control; Quantum Memory; Group-IV