Regensburg 2022 – wissenschaftliches Programm
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PLV X: Plenarvortrag
Donnerstag, 8. September 2022, 14:00–14:45, H2
Semiconductor quantum optics: from artificial atoms to atomically thin materials — •Jonathan Finley — Walter Schottky Institut, Am Coulombwall 4, 85748 Garching, Germany
Optically active confined spins in solids such as III-V semiconductor quantum dots (QDs), colour centres in diamond and atomic-scale defects in 2D-semiconductors are of interest for a wide range of applications in quantum science and technology. For example, in the context of photon-based quantum communication and computation electron and hole spins localized in single QDs can be used for the high rate (∼ GHz) on-demand generation of single photons with excellent Hong-Ou-Mandel (HOM) quantum indistinguishability, as well as entangled multi-photon cluster states. We will explore the factors currently limiting the performance of QD based non-classical light sources and discuss how methods derived from the quantum optical toolbox, such as incoherent spin pumping and coherent quantum state preparation can be used to both suppress unwanted re-excitation processes, that lead to multi-photon errors, while precisely timed stimulation pulses reduce the timing jitter of emitted photons, leading to much improved HOM indistinguishability. For few-spin systems hosted by electrically tunable QD-molecules, we will show how selective optical-charge generation can be used to suppress coupling of S-T spin states to electric and magnetic field fluctuations. Finally, we will explore how spin states in 2D-semiconductors are highly sensitive to lattice and macroscopic vibrational modes, providing interesting perspectives in quantum sensing and metrology.