APS Logo

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)

–

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