考虑电子与表面光学声子相互作用的极性晶体膜量子比特

Polar crystal film quantum bit considering interaction between electrons and SO phonons

基于线性组合算符法和变分法,讨论了极性晶体膜中电子与表面光学声子(SO)耦合强、与体纵光学声子(LO)耦合弱的电子-声子相互作用系统的量子比特及其声子效应。当膜中电子处于基态和第一激发态的叠加态,电子的概率密度在空间做周期性振荡。结果表明振荡周期随耦合强度的增加而减小,随极化子振动频率的增加而增大。考虑电子与SO声子的相互作用,极化子振动频率发生变化,引起电子概率密度发生改变。

Based on linear combination operator and variational method, the qubits and its phonon effects of electron phonon interaction system, in which the coupling of electron and surface optical （SO） phonon is strong, the coupling of electron and bulk longitudinal optical phonon is weak, are discussed in polar crystal film. When the electron is in the superposition state of the ground state and first excited state, the probability density of electrons is periodically oscillating in space. Results show that the oscillation period decreases with the increasing of coupling strength, and increases with the increasing of polaron vibration frequency. Considering the interaction between electron and SO phonon, the polaron vibration frequency changes, which causes the change of probability density of the electron.