三能级量子点梯形系统中的缀饰激子态和量子干涉
Dressed excitonic states and quantum interference in a three-level quantum dot ladder system
摘要：
在强驱动的三能级量子点梯形系统中观察到了修饰态和量子干涉效应。强耦合场对一个偶极跃迁的影响是通过弱探测场对第二个偶极跃迁的差分反射测量的。当耦合能远大于均匀线宽和非均匀线宽时，观察到Autler-Townes分裂。当强场和弱场共振的跃迁被交换时，特别是当耦合能几乎等于测量的线宽时，观察到显著的差异。这一结果归因于量子干涉：根据泵浦/探测几何形状观察到适度的相消干涉或相长干涉。实验结果表明，即使在强光照下，这种固态系统中的双激子和激子的相干性仍然保持不变，这对量子信息处理和非线性光学器件的发展具有重要意义.
英文摘要：
We observe dressed states and quantum interference effects in a strongly driven three-level quantum dot ladder system. The effect of a strong coupling field on one dipole transition is measured by a weak probe field on the second dipole transition using differential reflection. When the coupling energy is much larger than both the homoge-neous and inhomogeneous linewidths an Autler-Townes splitting is observed. Striking differences are observed when the transitions resonant with the strong and weak fields are swapped, particularly when the coupling energy is nearly equal to the measured linewidth. This result is attributed to quantum interference: a modest destructive or constructive interference is observed depending on the pump / probe geometry. The data demonstrate that coher-ence of both the bi-exciton and the exciton is maintained in this solid-state system, even under intense illumina-tion, which is crucial for prospects in quantum information processing and non-linear optical devices.
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