Dresden 2026 – wissenschaftliches Programm

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SYSD: Symposium SKM Dissertation Prize 2026

SYSD 1: SKM Dissertation Prize Symposium 2026

SYSD 1.4: Hauptvortrag

Montag, 9. März 2026, 11:00–11:30, HSZ/0002

Coherent Control Schemes for Semiconductor Quantum Systems — •Eva Schöll — PhoQS Institute, CeOPP, and Department of Physics, Paderborn University, Paderborn, Germany — Institute of Semiconductor and Solid State Physics, Johannes Kepler University, Linz, Austria — Institute for Integrated Circuits and Quantum Computing, Johannes Kepler University, Linz, Austria

Single photons are fundamental building blocks for advancing quantum technologies. Therefore, quantum light sources that simultaneously exhibit properties such as high single-photon purity, indistinguishability, and entanglement fidelity are essential. Semiconductor quantum dots (QDs) are promising candidates that already meet many of these requirements. In this talk, I will provide a deeper understanding of the underlying quantum-level schemes and reveal an intrinsic limit on indistinguishability for photons arising from a radiative cascade. To address this, we studied QDs under s-shell resonant excitation and two-photon excitation (TPE), and introduced a novel excitation technique combining TPE with stimulation of the first transition. This method can overcome the previously mentioned limit on indistinguishability.

Keywords: semiconductor quantum dots; single photon source; photon indistinguishability