Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 71: Quantum Information Systems (joint session HL/TT)

TT 71.8: Talk

Wednesday, March 14, 2018, 17:00–17:15, EW 203

Theory of long-range coherent electron shuttling devices in Silicon/Silicon-Germanium quantum wells — •Veit Langrock, Arne Hollmann, Inga Seidler, Lars R. Schreiber, and David P. DiVincenzo — JARA-FIT Institute for Quantum Information, RWTH Aachen University, Germany

Silicon quantum computing is at a stage where single qubits confined in electrostatically formed quantum dots with very long coherence times can be manufactured. To make the transition to large scale quantum computing, long range on chip coupling (over micrometer distances) is a building block that is currently still missing. A concept currently pursued experimentally is the coherent shuttling of electrons via moving electrostatic quantum dot configurations, with information encoded in the electron’s spin state. In this talk, we present theoretical considerations and simulations regarding moving electrostatically formed quantum dots through a Silicon/Silicon-Germanium (Si/SiGe) quantum well. Emphasis will be put on the effects that interface disorder in the form of miscut steps along the Si/SiGe quantum well interfaces will have on the moving electron’s spin environment, with the valley dependence in silicon playing a crucial role.