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Spin Qubits Silicon Quantum Computing

Anisotropic exchange coupling in a nanowire double quantum dot with strong spin-orbit coupling

arXiv
Authors: Rui Li, J. Q. You

Year

2013

Paper ID

2224

Status

Preprint

Abstract Read

~2 min

Abstract Words

115

Citations

N/A

Abstract

A spin-orbit qubit is a hybrid qubit that contains both orbital and spin degrees of freedom of an electron in a quantum dot. Here we study the exchange coupling between two spin-orbit qubits in a nanowire double quantum dot (DQD) with strong spin-orbit coupling (SOC). We find that while the total tunneling in the DQD is irrelevant to the SOC, both the spin-conserved and spin-flipped tunnelings are SOC dependent and can compete with each other in the strong SOC regime. Moreover, the Coulomb repulsion between electrons can combine with the SOC-dependent tunnelings to yield an anisotropic exchange coupling between the two spin-orbit qubits. Also, we give an explicit physical mechanism for this anisotropic exchange coupling.

Why This Paper Matters

  • This paper contributes to the Spin Qubits & Silicon Quantum Computing research area in the Quantum Articles archive.
  • It adds a 2013 reference point for readers tracking recent quantum research.
  • A spin-orbit qubit is a hybrid qubit that contains both orbital and spin degrees of freedom of an electron in a quantum dot.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1401.0101 [2] arXiv https://arxiv.org/abs/1401.0101 [3] Publisher https://arxiv.org/abs/1401.0101

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