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Quantum decoherence dynamics of divacancy spins in silicon carbide

Author

Listed:
  • Hosung Seo

    (The Institute for Molecular Engineering, The University of Chicago)

  • Abram L. Falk

    (The Institute for Molecular Engineering, The University of Chicago
    IBM T.J. Watson Research Center)

  • Paul V. Klimov

    (The Institute for Molecular Engineering, The University of Chicago)

  • Kevin C. Miao

    (The Institute for Molecular Engineering, The University of Chicago)

  • Giulia Galli

    (The Institute for Molecular Engineering, The University of Chicago
    Argonne National Laboratory)

  • David D. Awschalom

    (The Institute for Molecular Engineering, The University of Chicago)

Abstract

Long coherence times are key to the performance of quantum bits (qubits). Here, we experimentally and theoretically show that the Hahn-echo coherence time of electron spins associated with divacancy defects in 4H–SiC reaches 1.3 ms, one of the longest Hahn-echo coherence times of an electron spin in a naturally isotopic crystal. Using a first-principles microscopic quantum-bath model, we find that two factors determine the unusually robust coherence. First, in the presence of moderate magnetic fields (30 mT and above), the 29Si and 13C paramagnetic nuclear spin baths are decoupled. In addition, because SiC is a binary crystal, homo-nuclear spin pairs are both diluted and forbidden from forming strongly coupled, nearest-neighbour spin pairs. Longer neighbour distances result in fewer nuclear spin flip-flops, a less fluctuating intra-crystalline magnetic environment, and thus a longer coherence time. Our results point to polyatomic crystals as promising hosts for coherent qubits in the solid state.

Suggested Citation

  • Hosung Seo & Abram L. Falk & Paul V. Klimov & Kevin C. Miao & Giulia Galli & David D. Awschalom, 2016. "Quantum decoherence dynamics of divacancy spins in silicon carbide," Nature Communications, Nature, vol. 7(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12935
    DOI: 10.1038/ncomms12935
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    Cited by:

    1. Abouelkhir, N. & EL Hadfi, H. & Slaoui, A. & Ahl Laamara, R., 2023. "A simple analytical expression of quantum Fisher and Skew information and their dynamics under decoherence channels," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 612(C).
    2. Hannah L. Stern & Qiushi Gu & John Jarman & Simone Eizagirre Barker & Noah Mendelson & Dipankar Chugh & Sam Schott & Hoe H. Tan & Henning Sirringhaus & Igor Aharonovich & Mete Atatüre, 2022. "Room-temperature optically detected magnetic resonance of single defects in hexagonal boron nitride," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    3. Cunzhi Zhang & Francois Gygi & Giulia Galli, 2023. "Engineering the formation of spin-defects from first principles," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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