Electric coupling and long dephasing times of single defect spins in commercial 4H-SiC

ORAL

Abstract

Divacancies (VV) in silicon carbide (SiC) are a promising platform for quantum communication owing to their long-lived spin coherence [1] and high-fidelity spin-to-photon interface [2] in a wafer-scale host material. Here, we investigate the properties of single basal kh VV in commercially available 4H-SiC. We report an electronic ground-state spin dephasing time (T2*) exceeding 60 µs for a single kh VV at 4 K, which is among the longest reported in a naturally abundant host. Furthermore, the C1h symmetry of kh VV quenches dynamic Jahn-Teller distortions, leading to long optical coherence and excited-state energy level coupling with ac electric fields. We observe optical Rabi oscillations with coherence times approaching the lifetime limit, permitting high-visibility quantum interference of emitted photons. We demonstrate coupling between excited-state energy levels and ac electric fields through the observation of a Floquet-dressed optical spectrum. These robust spin and optical properties make the kh VV a versatile candidate for quantum information processing and hybrid system applications.

[1] Seo, H. et al. Nat. Commun. 7, 12935 (2016).
[2] Christle, D. et al. Phys. Rev. X. 7, 021046 (2017).

*This work is supported by AFOSR, ARO, NDSEG, NSF, and UChicago MRSEC.

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Presenters

  • Kevin Miao

    • University of Chicago

Authors

  • Kevin Miao

    • University of Chicago

  • Alexandre Bourassa

    • University of Chicago

  • Christopher P Anderson

    • University of Chicago

  • Samuel Whiteley

    • University of Chicago
    • Institute for Molecular Engineering and Department of Physics, University of Chicago
    • Institute for Molecular Engineering, University of Chicago

  • Alexander Crook

    • University of Chicago

  • Samuel L Bayliss

    • University of Chicago

  • Gary Wolfowicz

    • University of Chicago
    • Institute for Molecular Engineering, University of Chicago

  • Peter Udvarhelyi

    • Hungarian Academy of Sciences

  • Gergo Thiering

    • Hungarian Academy of Sciences

  • Viktor Ivady

    • Wigner Research Centre for Physics
    • Hungarian Academy of Sciences

  • Hiroshi Abe

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

  • Takeshi Ohshima

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

  • Adam Gali

    • Hungarian Academy of Sciences
    • Institute for Solid State Physics and Optics, Wigner Research Centre for Physics
    • Wigner Research Centre for Physics

  • David Awschalom

    • University of Chicago
    • Institute for Molecular Engineering, University of Chicago