Stabilization of a solid-state spin qubit in a decoherence-protected subspace

ORAL

Abstract

Basal divacancies in silicon carbide (SiC) are solid-state spin systems with excellent spin coherence properties due to a clock transition at zero magnetic field [1,2]. When embedded in a decoherence-protected subspace (DPS) using a microwave dressing drive, the spin becomes highly insensitive to magnetic and electric fluctuations caused by impurities in the surrounding SiC lattice, resulting in record-long spin dephasing times greater than 22 ms [2]. Operation at the zero-field condition is accomplished using vector-magnetic control of the local field guided by analytical models of the DPS ground-state energy levels. Ramsey spectroscopy within the DPS is used to perform feedback that negates the effects of hertz-level shifts to the DPS energy levels that would otherwise introduce spurious dephasing. This demonstration of the coherence measurement of an electron spin qubit in a DPS indicates that utilizing this technique could lead to similar improvements in other systems where long coherence times and fast control are needed.
[1] Miao, K. et al. Sci. Adv. 5 (2019)
[2] Miao, K. et al. Science 369, 1493–1497 (2019)

*DARPA, AFOSR, ONR, NSF, and UChicago MRSEC.

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Presenters

  • Joseph Blanton

    • Pritzker School of Molecular Engineering, University of Chicago
    • University of Chicago

Authors

  • Joseph Blanton

    • Pritzker School of Molecular Engineering, University of Chicago
    • University of Chicago

  • Kevin Miao

    • Pritzker School of Molecular Engineering, University of Chicago
    • University of Chicago

  • Christopher Anderson

    • Pritzker School of Molecular Engineering, University of Chicago
    • Pritzker School for Molecular Engineering, University of Chicago
    • University of Chicago

  • Alexandre Bourassa

    • Pritzker School of Molecular Engineering, University of Chicago
    • University of Chicago

  • Alexander Crook

    • Pritzker School of Molecular Engineering, University of Chicago
    • Department of Physics, University of Chicago

  • Gary Wolfowicz

    • Argonne National Lab
    • Argonne National Laboratory, Center for Molecular Engineering and Materials Science Division
    • Center for Molecular Engineering, Materials Science Division, Argonne National Laboratory
    • Argonne National Laboratory, Argonne

  • Hiroshi Abe

    • National Institutes for Quantum and Radiological Science and Technology
    • National Institutes for Quantum and Radiological Science and Technology (QST)

  • Takeshi Ohshima

    • National Institutes for Quantum and Radiological Science and Technology
    • National Institutes for Quantum and Radiological Science and Technology (QST)

  • 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