Dressed excitonic states and quantum interference in a three-level quantum dot ladder system
Dressed excitonic states and quantum interference in a three-level quantum dot ladder system
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DOI：
10.1088/1367-2630/11/1/013028
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发表时间：
2009-01-20
影响因子：
3.3
通讯作者：
Warburton, R. J.
中科院分区：
文献类型：
--
作者：
Gerardot, B. D.;Brunner, D.;Warburton, R. J.
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和非均匀线宽时，观察到Autler-Townes分裂。当与强场和弱场共振的跃迁被交换时，特别是当耦合能量几乎等于测量的线宽时，观察到显着的差异。这一结果归因于量子干涉：根据泵浦/探测器的几何形状，观察到具有适度可见度的相消干涉或相长干涉。数据表明，在这种固态系统中，即使在强光照下，双激子和激子的相干性也保持不变，这对于量子信息处理和非线性光学器件的前景至关重要。
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 homogeneous and inhomogeneous linewidths an Autler-Townes splitting is observed. Significant 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: destructive or constructive interference with modest visibility is observed depending on the pump/probe geometry. The data demonstrate that coherence of both the bi-exciton and the exciton is maintained in this solid-state system, even under intense illumination, which is crucial for prospects in quantum information processing and nonlinear optical devices.