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Magnon-mediated entanglement of spin qubits via on- and off-resonant interactions

ORAL

Abstract

The ability to manipulate entanglement between multiple qubits is essential in quantum information processing. While nitrogen-vacancy (NV) centers in diamond are a promising qubit platform, developing their two-qubit gates in a scalable fashion remains a well-known challenge. To this end, magnon-mediated long-distance entanglement schemes have been proposed and attracted attention [1,2]. Optimal device geometries and gate protocols, however, have yet to be explored. Here we first predict [3] strong long-distance NV-NV interactions via magnons in ferromagnet bar and waveguide structures. Moreover, we explore and compare on-resonant transduction and off-resonant virtual-magnon exchange protocols, and discuss which one is suitable to create entangled states under realistic experimental conditions. This work serves as a guide for future experiments that aim to entangle spin qubits in solids through magnon excitations.

[1] L. Trifunovic et al., Phys. Rev. X 3, 041023 (2013)
[2] D. R. Candido et al., Materials for Quantum Technology (2020) in press (arXiv:2003.04341)
[3] M. Fukami et al., in preparation

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Presenters

  • Masaya Fukami

    Pritzker School of Molecular Engineering, University of Chicago

Authors

  • Masaya Fukami

    Pritzker School of Molecular Engineering, University of Chicago

  • Denis R Candido

    Department of Physics and Astronomy, University of Iowa, University of Iowa, Univ of Iowa

  • David Awschalom

    University of Chicago, Pritzker School of Molecular Engineering, University of Chicago, Pritzker School for Molecular Engineering, University of Chicago, Center for Molecular Engineering, Materials Science Division, Argonne National Laboratory

  • Michael Flatté

    Department of Physics and Astronomy, The University of Iowa, University of Iowa, Department of Physics, University of Iowa, Physics and Astronomy, Univ of Iowa, Department of Physics and Astronomy, University of Iowa, Department of Applied Physics, Eindhoven University of Technology, Department of Physics, University of Iowa; Department of Applied Physics, Eindhoven University of Technology, Univ. of Iowa/Eindoven University of Technology, Department of Physics and Astronomy, University of Iowa, Univ of Iowa