Semiconductor nanostructures integrated in optical microresonators are of enormous interest both for fundamental research of resonator-high nanophotonic devices and their future applications - for example in optical quantum technology. The study and understanding of such devices with low photon number and collective effects requires an analysis not only of the emitted light intensity, but also of the second-order photonic autocorrelation function. Both quantities together form the first two moments of photon statistics. For a complete characterisation and understanding, it would be extremely beneficial to have access to the full photon statistics, which would be equivalent to knowing all moments.
Using a photon number-resolving transition edge sensor (TES), the full photon statistics of specially designed semiconductor quantum dot systems are measured, which exhibit collective effects: (i) superradiant quantum dots in a homogeneous medium and in optical micropillars, and (ii) bimodal micropillar lasers with quantum dots as gain material. In both cases, an advanced deterministic growth technique is used to control the number and position of the quantum dots involved. For the microresonator case, we also plan to study the photon statistics at a so-called exceptional point, a spectral singularity in open systems, which is currently receiving much attention.
|Deutsche Forschungsgemeinschaft (DFG)