Regensburg 2025 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

HL: Fachverband Halbleiterphysik

HL 29: Poster II

HL 29.67: Poster

Tuesday, March 18, 2025, 18:00–20:00, P1

Multiphoton Emission of Quantum Dots with Different Excitation Schemes — •Patricia Kallert, Nicolás Claro-Rodríguez, Francesco Salusti, Sonja Barkhofen, Santiago Bermúdez Feijóo, Lukas Hanschke, Normen Auler, Dirk Reuter, and Klaus D. Jöns — PhoQS Institute, CeOPP, and Department of Physics, Paderborn University, Paderborn, Germany

High efficiency, single-photon purity, high indistinguishability, and good qualities as entangled-photon pair emitters are key properties of ideal sources for photon-based quantum technologies. Accordingly, semiconductor quantum dots (QDs) are promising candidates. If a multi-level system is excited coherently with optical pulses of different pulse areas, such as 1π, 2π and higher, the system experiences Rabi rotations of the according rotation and the respective population inversions. For each pulse area, the probability of emitting different photon numbers for different pulse areas varies, which is recognizable in the second correlation function. [1] Since various excitation schemes are interesting for different qualities of QDs, we analyze the multiphoton emission characteristics with different excitation schemes. We anticipate that this gives a deeper insight into the structure of the emitted states and possible applications to generate customised quantum light states and required modifications to generate them.

[1] Fischer, K., Hanschke, et al. Signatures of two-photon pulses from a quantum two-level system. Nature Phys 13, 649-654 (2017).

Keywords: Multi-photon Emission; Semiconductor Quantum Dots