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利用粒子数运动方程和量子回归理论,计算了单个半导体量子点双激子体系脉冲激发下粒子在各能级间辐射跃迁的二阶交叉相关函数以及系统发射光子对的偏振密度矩阵.分析了激子态能级简并量子点体系发射光子对偏振纠缠特性,讨论了纠缠度随激子态间自旋弛豫的变化关系.研究表明,激子自旋弛豫会破坏该系统发射光子对的纠缠度.
The second-order cross-correlation function and the polarization density matrix of the emitted photon pairs were calculated by using the particle number equation of motion and the quantum regression theory. The relationship between the entanglement and the spin relaxation in the exciton state is discussed. The results show that the exciton spin relaxation will destroy the photon pair emitted by this system Entanglement.