Readout and control of an endofullerene electronic spin

Dinesh Pinto, Domenico Paone, Bastian Kern, Tim Dierker, René Wieczorek, Aparajita Singha, Durga Dasari, Amit Finkler, Wolfgang Harneit, Jörg Wrachtrup and Klaus Kern ()
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Dinesh Pinto: Max Planck Institute for Solid State Research
Domenico Paone: Max Planck Institute for Solid State Research
Bastian Kern: Max Planck Institute for Solid State Research
Tim Dierker: University of Osnabrück
René Wieczorek: University of Osnabrück
Aparajita Singha: Max Planck Institute for Solid State Research
Durga Dasari: University of Stuttgart
Amit Finkler: University of Stuttgart
Wolfgang Harneit: University of Osnabrück
Jörg Wrachtrup: Max Planck Institute for Solid State Research
Klaus Kern: Max Planck Institute for Solid State Research

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract Atomic spins for quantum technologies need to be individually addressed and positioned with nanoscale precision. C60 fullerene cages offer a robust packaging for atomic spins, while allowing in-situ physical positioning at the nanoscale. However, achieving single-spin level readout and control of endofullerenes has so far remained elusive. In this work, we demonstrate electron paramagnetic resonance on an encapsulated nitrogen spin (14N@C60) within a C60 matrix using a single near-surface nitrogen vacancy (NV) center in diamond at 4.7 K. Exploiting the strong magnetic dipolar interaction between the NV and endofullerene electronic spins, we demonstrate radio-frequency pulse controlled Rabi oscillations and measure spin-echos on an encapsulated spin. Modeling the results using second-order perturbation theory reveals an enhanced hyperfine interaction and zero-field splitting, possibly caused by surface adsorption on diamond. These results demonstrate the first step towards controlling single endofullerenes, and possibly building large-scale endofullerene quantum machines, which can be scaled using standard positioning or self-assembly methods.

Date: 2020
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DOI: 10.1038/s41467-020-20202-3

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