SKM 2023 – wissenschaftliches Programm
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SYQD: Symposium Real-Time Measurements of Quantum Dynamics
SYQD 1: Real-Time Measurements of Quantum Dynamics
SYQD 1.3: Hauptvortrag
Donnerstag, 30. März 2023, 10:30–11:00, HSZ 01
Optical Detection of Real-Time Quantum Dynamics in Quantum Dots — •Martin Geller1, Jens Kerski1, Eric Kleinherbers1, Jürgen König1, Annika Kurzmann2, Pia Lochner1, Axel Lorke1, Arne Ludwig3, Hendrik Mannel1, Philipp Stegmann1, Andreas Wieck3, and Marcel Zöllner1 — 1Faculty of Physics, University of Duisburg-Essen, 47057 Duisburg, Germany — 22nd Institute of Physics and JARA-FIT, RWTH Aachen University, 52074 Aachen, Germany — 3Applied Solid State Physics, Ruhr-University, 44780 Bochum, Germany
Recording every single quantum event in a real-time measurement gives the maximum information of a dynamical quantum system. The obtained time traces can be used in a statistical evaluation to get a deep understanding about the underlying physical mechanisms. We use a self-assembled quantum dot coupled to a reservoir in combination with resonant optical excitation to study phenomena such as electron tunneling [1] and Auger recombination [2] with a time resolution down to single quantum events. The resulting telegraph signal is evaluated by full counting statistics to obtain deep insights into the spin and charge dynamics, where we use factorial cumulants as a very sensitive statistical tool to reduce the influence of statistical and systematic errors [3]. We show that factorial cumulants together with optical excitation push the limits in the detection and analysis of random telegraph data.
[1] Kurzmann et al., PRL 122, 247403 (2019). [2] Lochner, et al. Nano Lett. 20, 1631 (2020). [3] Kleinherbers et al., PRL 128, 087701 (2022).