SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 10: Materials and devices for quantum technology (joint session HL/TT)
TT 10.5: Vortrag
Mittwoch, 29. September 2021, 11:15–11:30, H4
Optoelectronic sampling of ultrafast electric transients with single quantum dots — •Sebastian Krehs1, Alex Widhalm1,2, Dustin Siebert2, Nand Lal Sharma1,3, Timo Langer1, Björn Jonas1, Dirk Reuter1, Andreas Thiede2, Jens Förstner2, and Artur Zrenner1 — 1Paderborn University, Physics Department, Warburger Straße 100, 33098 Paderborn, Germany — 2Paderborn University, Electrical Engineering Department, Warburger Straße 100, 33098 Paderborn, Germany — 3Institute for Integrative Nanosciences, Leibniz IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany
The use of quantum systems as sensors promises high sensitivity, high precision and access to nanoscale applications. In our work, we have pioneered optoelectronic sampling of ultrafast electric signals with low capacitance single quantum dots photodiodes as sensor devices [1]. Our concept exploits the Stark effect to convert a time-dependent electric signal into a time-dependent shift of the QD transition energy. Time resolved measurements of the shift can be measured by resonant ps laser spectroscopy with spectrally tunable photocurrent detection. With our method we are able to sample the laser synchronous output pulse of an ultrafast CMOS circuit at cryogenic temperatures. We demonstrate an impressive sub-20 ps time resolution and an amplitude resolution in the mV-range. Theoretical calculations show that the accuracy of our method is not affected or limited by a moderate timing jitter or the optical pulse width.
[1] http://arxiv.org/abs/2106.00994