Spin-orbit Interactions for Singlet-Triplet Qubits in Silicon

被引：49

作者：

Harvey-Collard, Patrick ^{[1
,2
]}

Jacobson, N. Tobias ^{[3
]}

Bureau-Oxton, Chloe ^{[1
,2
]}

Jock, Ryan M. ^{[2
]}

Srinivasa, Vanita ^{[3
]}

Mounce, Andrew M. ^{[2
]}

Ward, Daniel R. ^{[2
]}

Anderson, John M. ^{[2
]}

Manginell, Ronald P. ^{[2
]}

Wendt, Joel R. ^{[2
]}

Pluym, Tammy ^{[2
]}

Lilly, Michael P. ^{[4
]}

Luhman, Dwight R. ^{[2
]}

Pioro-Ladriere, Michel ^{[1
,5
]}

Carroll, Malcolm S. ^{[2
]}

机构：

[1] Univ Sherbrooke, Dept Phys & Inst Quant, Sherbrooke, PQ J1K 2R1, Canada

[2] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA

[3] Sandia Natl Labs, Ctr Comp Res, POB 5800, Albuquerque, NM 87185 USA

[4] Sandia Natl Labs, Ctr Integrated Nanotechnol, POB 5800, Albuquerque, NM 87185 USA

[5] Canadian Inst Adv Res, Quantum Informat Sci Program, Toronto, ON M5G 1Z8, Canada

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 21期

关键词：

Bulk silicon - Dissimilar interfaces - Double quantum dots - Electron pair - Magnetic field orientations - Singlet-triplet - Spin orbit interactions - Two-qubit gates;

D O I：

10.1103/PhysRevLett.122.217702

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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.

引用

页数：6

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