Effects of Electric and Magnetic Fields on Pure Dephasing of Exciton Qubits

• 来源期刊: 理论物理通讯（英文版）
• 年，卷（期）: 2009,（3）
• 页码范围: 540-544
• 页数: 5页
• 语种: 英文

摘要

In a two-dimensional quantum dot (QD) with parabolic confinement potential, we investigate pure dephasing due to deformation potential exciton-bulk longitudinal acoustic phonons (LAP) interaction for exciton qubits under the influence of external static electric and magnetic fields by adopting the full quantum-mechanical method of Kunihiro Kojima and Akihisa Tomita. The wave function is found and the dependence of the pure dephusing factor on the confinement length of the QD and time and temperature is discussed. We find the external electric and magnetic fields have important effects on pure dephasing of exciton qubits because exciton-LAP interaction increases, leading to more pure dephasing.