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Degen MJ, Loenen SJH, Bartling HP, et al. Entanglement of dark electron-nuclear spin defects in diamond. Nat Commun. 2021;12(1):3470doi: 10.1038/s41467-021-23454-9.
Degen, M. J., Loenen, S. J. H., Bartling, H. P., Bradley, C. E., Meinsma, A. L., Markham, M., Twitchen, D. J., & Taminiau, T. H. (2021). Entanglement of dark electron-nuclear spin defects in diamond. Nature communications, 12(1), 3470. https://doi.org/10.1038/s41467-021-23454-9
Degen, M J, et al. "Entanglement of dark electron-nuclear spin defects in diamond." Nature communications vol. 12,1 (2021): 3470. doi: https://doi.org/10.1038/s41467-021-23454-9
Degen MJ, Loenen SJH, Bartling HP, Bradley CE, Meinsma AL, Markham M, Twitchen DJ, Taminiau TH. Entanglement of dark electron-nuclear spin defects in diamond. Nat Commun. 2021 Jun 09;12(1):3470. doi: 10.1038/s41467-021-23454-9. PMID: 34108455; PMCID: PMC8190113.
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Nat Commun. 2021 Jun 09;12(1):3470. doi: 10.1038/s41467-021-23454-9.

Entanglement of dark electron-nuclear spin defects in diamond.

Nature communications

M J Degen, S J H Loenen, H P Bartling, C E Bradley, A L Meinsma, M Markham, D J Twitchen, T H Taminiau

Affiliations

  1. QuTech, Delft University of Technology, Delft, The Netherlands.
  2. Kavli Institute of Nanoscience Delft, Delft University of Technology, Delft, The Netherlands.
  3. Element Six Innovation, Fermi Avenue, Harwell Oxford, Didcot, Oxfordshire, UK.
  4. QuTech, Delft University of Technology, Delft, The Netherlands. [email protected].
  5. Kavli Institute of Nanoscience Delft, Delft University of Technology, Delft, The Netherlands. [email protected].

PMID: 34108455 PMCID: PMC8190113 DOI: 10.1038/s41467-021-23454-9

Abstract

A promising approach for multi-qubit quantum registers is to use optically addressable spins to control multiple dark electron-spin defects in the environment. While recent experiments have observed signatures of coherent interactions with such dark spins, it is an open challenge to realize the individual control required for quantum information processing. Here, we demonstrate the heralded initialisation, control and entanglement of individual dark spins associated to multiple P1 centers, which are part of a spin bath surrounding a nitrogen-vacancy center in diamond. We realize projective measurements to prepare the multiple degrees of freedom of P1 centers-their Jahn-Teller axis, nuclear spin and charge state-and exploit these to selectively access multiple P1s in the bath. We develop control and single-shot readout of the nuclear and electron spin, and use this to demonstrate an entangled state of two P1 centers. These results provide a proof-of-principle towards using dark electron-nuclear spin defects as qubits for quantum sensing, computation and networks.

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