Direct optical state preparation of the dark exciton in a quantum dot

Abstract

Because of their weak coupling to the electromagnetic field dark excitons in semiconductor quantum dots possess extremely long lifetimes, which makes them attractive candidates for quantum information processing. On the other hand, preparation and manipulation of dark states is challenging, because commonly used optical excitation mechanisms are not applicable. We propose a new, efficient mechanism for the deterministic preparation of the dark exciton exploiting the application of a tilted magnetic field and the optical excitation with a chirped, i.e., frequency modulated, laser pulse.

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• The optical Stark shift to control the dark exciton occupation of a quantum dot in a tilted magnetic field
• Phonon-assisted dark exciton preparation in a quantum dot
• Valley-contrasting interband transitions and excitons in symmetrically biased dice model
• Theory of time-bin entangled photons from quantum emitters
• Quantitative analysis of the blue-green single-photon emission from a quantum dot in a thick tapered nanowire
• Towards Photon-Number-Encoded High-dimensional Entanglement from a Sequentially Excited Quantum Three-Level System
• Deterministic photon storage and readout in a semimagnetic quantum-dot--cavity system doped with a single Mn ion