The Decoherence of GaAs Quantum Dot Qubit Due to Electron-Phonon Interactions

摘要

We investigate electron charge decoherence in a GaAs single-electron semiconductor quantum dot through electron-phonon interaction. We analytically and numerically evaluate decoherence time within the Lee-Low-Pines-Huybrecht variational calculation for all coupling strengths. The dependence of decoherence time on the electron-LO-phonon coupling strength and the size of quantum dot is investigated. Our results suggest that electron-phonon interaction has very important effects on charge decoherence.