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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 Geller1 — 1Faculty 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).