Controlling a Nanowire Spin-Orbit Qubit via Electric-Dipole Spin Resonance

Abstract

A semiconductor nanowire quantum dot with strong spin-orbit coupling (SOC) can be used to achieve a spin-orbit qubit. In contrast to a spin qubit, the spin-orbit qubit can respond to an external ac electric field, an effect called electric-dipole spin resonance. Here we develop a theory that can apply in the strong SOC regime. We find that there is an optimal SOC strength η_{opt}=\sqrt{2}/2, where the Rabi frequency induced by the ac electric field becomes maximal. Also, we show that both the level spacing and the Rabi frequency of the spin-orbit qubit have periodic responses to the direction of the external static magnetic field. These responses can be used to determine the SOC in the nanowire.

5 pages, 3 figures + Supplementary Material

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• Multi-qubit DC gates over an inhomogeneous array of quantum dots
• Spin-relaxation anisotropy in a nanowire quantum dot with strong spin-orbit coupling
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• Searching strong `spin'-orbit coupled one-dimensional hole gas in strong magnetic fields
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