Regensburg 2025 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 19: Focus Session: Quantum Emission from Chaotic Microcavities (joint session HL/DY)

DY 19.4: Hauptvortrag

Mittwoch, 19. März 2025, 11:15–11:45, H17

Correlations and statistics in cavity embedded quantum dot sources of quantum light — •Ana Predojevic — Stockholm University, Stockholm, Sweden

Single quantum dots coupled to photonic cavities are established emitters of single photons and entangled photon pairs. The cascaded generation of photon pairs intrinsically contains temporal correlations that negatively affect the ability of such sources to perform two-photon interference, hindering applications. I will show how such correlation interacts with decoherence and temporal postselection, and under what conditions temporal postselection could improve two-photon interference visibility. Our study identifies crucial parameters of the source and shows the way to achieve optimal performance. The single photons emitted by a quantum dot exhibit quantum statistics, which is usually verified in an autocorrelation measurement. Single photons can be subjected to more extensive tests of quantum nature, such as non-Gaussianity. However, there is little evidence that such a measurement can be made on pairs of photons. I will show that pairs of photons exhibit strongly non-classical properties that can be quantified. Our result is applicable to a wide range of quantum light sources and measurement methods.

Keywords: quantum optics