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

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.

7 pages, 4 figures

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• The impacts of the quantum-dot confining potential on the spin-orbit effect
• Electric dipole spin resonance at shallow donors in quantum wires
• Spin-Orbit Interaction Enabled High-Fidelity Two-Qubit Gates
• Energy spectrum, the spin polarization, and the optical selection rules of the Kronig-Penney superlattice model with spin-orbit coupling
• Multi-qubit DC gates over an inhomogeneous array of quantum dots
• Cloaking the magnons
• Hyperfine interaction mediated electric-dipole spin resonance: the role of frequency modulation
• Spin qubit shuttling between coupled quantum dots with inhomogeneous Landé g-tensors