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QI: Fachverband Quanteninformation
QI 32: Quantum Sensing and Metrology
QI 32.8: Vortrag
Freitag, 22. März 2024, 11:45–12:00, HFT-FT 131
Quantum sensing of RF signals with spin defects in a 2D material — •Roberto Rizzato1,2, Martin Schalk2,3, Stephan Mohr1, Jens Hermann1,2, Joachim Leibold1, Fleming Bruckmaier1, Giovanna Salvitti1, Chenjiang Qian3, Peirui Ji3, Georgy Astakhov4, Ulrich Kentsch4, Manfred Helm4, Andreas Stier2,3, Jonathan Finley2,3, and Dominik Bucher1,2 — 1Technical University of Munich, TUM School of Natural Sciences, Department of Chemistry, 85748 Garching, Germany. — 2Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany. — 3Technical University of Munich, Walter Schottky Institut, 85748 Garching, Germany — 4Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstraße 400, Dresden, 01328, Germany
Negatively-charged Boron Vacancy centers (VB-) in hexagonal Boron Nitride (hBN) are attracting increasing interest since they represent optically-addressable qubits in a 2D material. In particular, these spin defects have shown promise as sensors for temperature, pressure, and static magnetic fields. However, their short spin coherence time limits their scope for quantum technology. Here, we apply dynamical decoupling techniques to suppress magnetic noise and extend the spin coherence time by two orders of magnitude, approaching the fundamental T1 relaxation limit. Based on this, we demonstrate a set of quantum sensing protocols to detect RF signals with sub-Hz resolution. This work opens a promising path to the development of quantum technology integrated into ultra-thin structures.
Keywords: Quantum Sensing; 2D Materials; Spin Defects; Qubits; Quantum Technology