解决量子点-腔系统远共振辐射中的反直觉光子关联之谜
Resolution of the mystery of counter-intuitive photon correlations in far off-resonance emission from a quantum dot-cavity system
摘要：
腔量子电动力学实验使用耦合到一个单一的辐射场模式的原子发挥了核心作用，在测试量子力学的基础，从而激励固态实现使用单量子点耦合到单片纳米腔。与基于原子的对应物形成鲜明对比的是，后者的实验揭示了强的腔发射，即使当量子点远离共振时也是如此。在这里，我们提出的实验和理论结果表明，这种效果产生的介观性质的量子点限制，确保存在一个准连续的激发量子点状态之间的过渡增强腔模式。我们的模型充分解释了光子相关测量，表明在腔频率发射的光子基本上是不相关的，即使它们是由单个量子点产生的。
英文摘要：
Cavity quantum-electrodynamics experiments using an atom coupled to a single radiation-field mode have played a central role in testing foundations of quantum mechanics, thus motivating solid-state implementations using single quantum dots coupled to monolithic nano-cavities. In stark contrast to their atom based counterparts, the latter experiments revealed strong cavity emission, even when the quantum dot is far off resonance. Here we present experimental and theoretical results demonstrating that this effect arises from the mesoscopic nature of quantum dot confinement, ensuring the presence of a quasi-continuum of transitions between excited quantum dot states that are enhanced by the cavity mode. Our model fully explains photon correlation measurements demonstrating that photons emitted at the cavity frequency are essentially uncorrelated with each other even though they are generated by a single quantum dot.
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