Coherent Control of Nitrogen Nuclear Spins via the VB−-Center in Hexagonal Boron Nitride
Adalbert Tibiássy (MTA-ELTE, Budapest, Eötvös Loránd University)
Charlie J. Patrickson (University of Exeter)
Thomas Poirier (Kansas State University)
James H. Edgar (Kansas State University)
Bruno Lopez-Rodriguez (TU Delft - ImPhys/Esmaeil Zadeh group)
Viktor Ivády (MTA-ELTE, Budapest, Eötvös Loránd University)
Isaac J. Luxmoore (University of Exeter)
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Abstract
Charged boron vacancies ((Formula presented.)) in hexagonal boron nitride (hBN) have emerged as a promising platform for quantum nanoscale sensing and imaging. While these primarily involve electron spins, nuclear spins provide an additional resource for quantum operations. This work presents a comprehensive experimental and theoretical study of the properties and coherent control of the nearest-neighbor (Formula presented.) nuclear spins of (Formula presented.) -ensembles in isotope-enriched (Formula presented.) (Formula presented.). Multi-nuclear spin states are selectively addressed, enabled by the state-specific nuclear spin transitions arising from spin-state mixing. We perform Rabi driving between selected state pairs, define elementary quantum gates, and measure longer than 10 (Formula presented.) nuclear Rabi coherence times. We observe a two orders of magnitude nuclear g-factor enhancement that underpins fast nuclear spin gates. Accompanying numerical simulations provide a deep insight into the underlying mechanisms. These results establish the foundations for leveraging nuclear spins in (Formula presented.) center-based quantum applications, particularly for extending coherence times and enhancing the sensitivity of 2D quantum sensing foils.
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