Scaling Spin Coherence in Solid-state Defect Qubit

ORAL

Abstract

The electron spin coherence time T2 is one of the most critical material parameters for qubits. Here we show a scaling relationship of T2 of solid-state spin qubits on electron and nuclear spins’ parameters based on the cluster correlation expansion (CCE) calculations, constituting a new tool for the qubit material exploration [1,2]. We calculate T2 for a single nuclear species for all stable spinful species with various spin densities n, and find that the scaling relationship T2,i ~ n-1.0|g|-1.6I-1.1 for a dilute (< 1022 cm-3) spinful nuclear bath (g: g-factor of nuclear spin, I: quantum number of nuclear spin). We show the nuclear spin baths are decoupled under external magnetic fields typically encountered in experiments (> 30 mT), and the T2 of the compounds can be estimated by (ΣiT2,i-2)-0.5. These relationships enable one to predict T2 of the materials without extensive computations.

[1] G. Wolfowicz et al., Nat. Rev. Mater. 6, 906 (2021).

[2] S. Kanai et al., arXiv 2102.02986 (2021).

*JSPS Kakenhi (19KK0130, 20H02178), JST-PRESTO JPMJPR21B2, U.S. DOE/BES grant through the EFRC Center for Novel Pathways to Quantum Coherence in Materials, National Quantum Information Science Research Centers, AFOSR (FA9550-19-1-0358), and Korea MSIT NRF (2018R1A4A1024157, 2019M3E4A1078666)

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Publication: S. Kanai et al., arXiv 2102.02986 (2021).

Presenters

  • Shun Kanai

    • Tohoku University
    • Tohoku University, Japan

Authors

  • Shun Kanai

    • Tohoku University
    • Tohoku University, Japan

  • F. Joseph F Heremans

    • Argonne National Laboratory and University of Chicago
    • Argonne National Laboratory

  • Hosung Seo

    • Ajou University
    • Ajou Univ

  • Gary Wolfowicz

    • Argonne National Laboratory and University of Chicago
    • Argonne National Laboratory

  • Christopher P Anderson

    • University of Chicago

  • Sean E Sullivan

    • Argonne National Laboratory

  • Mykyta Onizhuk

    • University of Chicago

  • Giulia Galli

    • University of Chicago
    • University of Chicago and Argonne National Laboratory

  • David D Awschalom

    • University of Chicago and Argonne National Laboratory
    • University of Chicago
    • University of Chicago, Argonne National Laboratory

  • Hideo Ohno

    • Tohoku University
    • Tohoku University, Japan