Freiburg 2019 – wissenschaftliches Programm
FM 53.4: Talk
Mittwoch, 25. September 2019, 15:00–15:15, 1010
Ultrafast high-frequency electronics in cryogenic environments: Perspectives for Quantum Technologies — •Kai J. Spychala, Alex Widhalm, Björn Jonas, Sebastian Krehs, and Artur Zrenner — Department of Physics, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany
The implementation of quantum effects in computation, simulation, sensing and communication requires a miniaturization and standardization effort, which makes it compatible with existing technologies. Beside the efforts to operate communication systems in the telecom bands, a very important prerequisite for scalability is the application of state of the art electronics for steering, read-out, as well as pre- and post-processing, in order to benefit from existing semiconductor technologies. As quantum phenomena are mostly short-lived and observed under cryogenic environments, robust high-frequency electronics, which can operate in the cryogenic regime, is needed.
We report our results on the design of ultrafast BiCMOS chips and their application for the steering of single self-assembled semiconductor QDs and QD molecules for quantum communication purposes. We show results on the ultrafast electric phase manipulation of an exciton qubit , the rapid adiabatic passage of an exciton qubit and present a scheme for Ramsey-based optoelectronic sampling. We also present a chip design for the implementation of an electric pulse protocol, that can be used to entangle spin-qubits in a QD molecule, in order to get a spin-photon interface for future quantum repeater applications.
Ref:  A. Widhalm et al., APL 112, 111105 (2018).