Dresden 2020 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 79: Quantum dots and wires IV

HL 79.8: Vortrag

Freitag, 20. März 2020, 11:30–11:45, POT 151

High-bandwith in an all-optical read-out scheme for quantum events — •Jens Kerski1, Hendrik Mannel1, Annika Kurzmann1, 2, Arne Ludwig3, Andreas D. Wieck3, Axel Lorke1, and Martin Geller11Faculty of Physics and CENIDE, University Duisburg-Essen, Germany — 2Solid State Physics Laboratory, ETH Zurich, Switzerland — 3Chair of Applied Solid State Physics, Ruhr-University Bochum, Germany

The maximum information about a dynamic quantum system can be drawn from real-time measurements of every single quantum event (random telegraph signal). Such studies are performed on single quantum dots (QDs) to investigate electron transport in an all-electrical measurement [1]. Unfortunately, these methods are either invasive or limited in bandwidth. However, it became recently possible to measure the random telegraph signal in a non-invasive all-optical scheme, using resonance fluorescence and a single self-assembled QD coupled to an electron reservoir [2].

This is a promising approach, as the bandwidth of this technique is given by the averaged number of emitted photons per second, limited ultimately by the spontaneous emission rate (∼1−10 GHz). In this contribution, we demonstrate this behavior by evaluating the random telegraph signal with full counting statistics and intensities up to 2.6 MCounts/second leading to bandwidths of more than 100 kHz.

[1] S. L. Rudge et al. J. Chem. Phys. 151, 034107 (2019).

[2] A. Kurzmann et al., Phys. Rev. Lett. 122, 247403 (2019).

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