Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 33: Quantum Dots: Optical Properties I
HL 33.4: Vortrag
Dienstag, 21. März 2017, 10:30–10:45, POT 81
Resonantly excited quantum dots: from quantum beats in temporal domain to two-photon interference of remote sources — •J. H. Weber1, H. Vural1, M. Müller1, C. Schneider2, S. L. Portalupi1, S. Höfling2,3, and P. Michler1 — 1IHFG, IQST Center and SCoPE, Universität Stuttgart — 2Physikalisches Institut, Universität Würzburg — 3School of Physics and Astronomy, University of St. Andrews, UK
Two-photon interference is a crucial building block for photonic quantum information technology such as linear optical quantum computation and quantum-enhanced phase determination. For such applications, highly indistinguishable single photons are essential. Single semiconductor quantum dots are promising emitters because of their high brightness, indistinguishability and on-demand single photon emission. Resonant excitation is proven to strongly reduce dephasing mechanisms. In the present study, we carry out coherent and on-demand initialization of the two-level system: in contrast to the commonly observed Rabi oscillations, here we prove this coherent initialization by the observation of strongly pronounced quantum beats in the temporal dynamics of the spontaneous emission. Furthermore, high indistinguishability of the subsequently emitted photons could be shown by exploiting the Hong-Ou-Mandel effect. To scale photonic quantum information processing with quantum dots, two-photon interference of distinct sources is crucial. Therefore, two remote quantum dots were tuned into resonance, accomplishing two-photon interference of the on-demand generated resonance fluorescence.