Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 53: Poster II

HL 53.25: Poster

Mittwoch, 9. März 2016, 09:30–13:30, Poster A

Improving the indistinguishability of single-photons from resonantly excited single semiconductor quantum dots — •Jonas H. Weber, Eva Schöll, Jan Kettler, Markus Müller, Simone L. Portalupi, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart, Germany

Single-photons from single semiconductor quantum dots are promising candidates for a number of applications within quantum information technology. As a key feature in various implementations, e.g. linear optical quantum computation, maximum photon indistinguishability is needed and therefore an important goal of on-going research. Two-photon interference in an optimised Hong-Ou-Mandel-like experiment was used to determine the degree of indistinguishability. On the way towards Fourier-limited photons, requirement for perfect indistinguishability, different excitation methods were investigated in order to minimise dephasing mechanisms in the quantum emitter. In contrast to above-band excitation, resonant pumping of the exciton state excites single electron-hole pairs, thereby reducing spectral diffusion. Another promising excitation scheme relies on the use of two-photon excitation to prepare the biexciton state. That simplifies the photon detection due to the spectral separation of pump beam and signal, improving the signal-to-noise ratio. In future experiments, we will focus on several approaches for the stabilisation of the two-level system. With an applied magnetic field, it is possible to compensate for the Overhouser field. Furthermore, an electric field can be applied to stabilise the Fermi level, also enabling slight tuning of the emission line.