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Spin-orbit Interactions for Singlet-Triplet Qubits in Silicon

机译：硅中单重三重量子位的自旋轨道相互作用

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摘要

Spin-orbit coupling is relatively weak for electrons in bulk silicon, but enhanced interactions are reported in nanostructures such as the quantum dots used for spin qubits. These interactions have been attributed to various dissimilar interface effects, including disorder or broken crystal symmetries. In this Letter, we use a double-quantum-dot qubit to probe these interactions by comparing the spins of separated singlet-triplet electron pairs. We observe both intravalley and intervalley mechanisms, each dominant for [110] and [100] magnetic field orientations, respectively, that arc consistent with a broken crystal symmetry model. We also observe a third spin-flip mechanism caused by tunneling between the quantum dots. This improved understanding is important for qubit uniformity, spin control and decoherence, and two-qubit gates.
机译：对于体硅中的电子，自旋轨道耦合相对较弱，但是据报道，纳米结构（例如用于自旋量子比特的量子点）之间的相互作用增强。这些相互作用归因于各种不同的界面效应，包括无序或破碎的晶体对称性。在这封信中，我们使用双量子点量子位通过比较分离的单重态-三重态电子对的自旋来探测这些相互作用。我们观察到了谷内和区间内机制，它们分别对[110]和[100]磁场方向起主导作用，与破碎的晶体对称模型一致。我们还观察到由量子点之间的隧穿引起的第三种自旋翻转机制。更好的理解对于量子位均匀性，自旋控制和去相干以及两个量子位门很重要。

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  • 来源
    《Physical review letters》 |2019年第21期|217702.1-217702.6|共6页
  • 作者

    Harvey-Collard Patrick; Jacobson N. Tobias; Bureau-Oxton Chloe; Jock Ryan M.; Srinivasa Vanita; Mounce Andrew M.; Ward Daniel R.; Anderson John M.; Manginell Ronald P.; Wendt Joel R.; Pluym Tammy; Lilly Michael P.; Luhman Dwight R.; Pioro-Ladriere Michel; Carroll Malcolm S.;

  • 作者单位

    Univ Sherbrooke, Dept Phys & Inst Quant, Sherbrooke, PQ J1K 2R1, Canada|Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA;

    Sandia Natl Labs, Ctr Comp Res, POB 5800, Albuquerque, NM 87185 USA;

    Univ Sherbrooke, Dept Phys & Inst Quant, Sherbrooke, PQ J1K 2R1, Canada|Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA;

    Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA;

    Sandia Natl Labs, Ctr Comp Res, POB 5800, Albuquerque, NM 87185 USA;

    Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA;

    Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA;

    Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA;

    Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA;

    Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA;

    Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA;

    Sandia Natl Labs, Ctr Integrated Nanotechnol, POB 5800, Albuquerque, NM 87185 USA;

    Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA;

    Univ Sherbrooke, Dept Phys & Inst Quant, Sherbrooke, PQ J1K 2R1, Canada|Canadian Inst Adv Res, Quantum Informat Sci Program, Toronto, ON M5G 1Z8, Canada;

    Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA;

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