Coherent Single Electron Spin Control in a Slanting Zeeman Field

Abstract

We consider a single electron in a 1D quantum dot with a static slanting Zeeman field. By combining the spin and orbital degrees of freedom of the electron, an effective quantum two-level (qubit) system is defined. This pseudospin can be coherently manipulated by the voltage applied to the gate electrodes, without the need for an external time-dependent magnetic field or spin-orbit coupling. Single-qubit rotations and the controlled-NOT operation can be realized. We estimated the relaxation ($T_1$) and coherence ($T_2$) times and the (tunable) quality factor. This scheme implies important experimental advantages for single electron spin control.