Magnetic field effects on the properties of GaAs quantum dot qubit due to electron-phonon interactions

摘要

We investigate the influence of magnetic field on the electron charge qubit in a GaAs single-electron semiconductor quantum dot (QD) including electron-LO-phonon interaction. We analytically and numerically evaluate decoherence time by applying the Lee-Low-Pines-Huybrecht (LLPH) variational calculation considering all coupling strengths. At the same time, the time evolution of the electron probability density is obtained, the dependence of decoherence time and the period of oscillation on the magnetic field strength and the size of QD is investigated. The results are expected to play an important role in designing the solid-state implementation of quantum computing.