Regensburg 2019 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 45: HL Posters III
HL 45.39: Poster
Thursday, April 4, 2019, 18:30–21:00, Poster E
An Optical Interface to Spin Qubits in GaAs — •Zheng Zeng1, Arne Ludwig2, Eva Groß1, Detlev Grützmacher1, Hendrik Bluhm3, and Beata Kardynał1 — 1Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, D-52425 Jülich, Germany — 2Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany — 3JARA-Institute for Quantum Information, RWTH Aachen University, D-52074 Aachen, Germany
Connecting quantum information processors over long distances using photons as qubits would enable more complex quantum computing architectures and quantum networks. Spin qubits in GaAs/AlGaAs gate-defined quantum dots (GDQDs) have been demonstrated to be promising scalable qubits. Since GaAs is a direct band gap material, a coherent transfer of information between a spin qubit and a photon qubit is in principle possible but cannot be achieved directly using GDQDs. Here we investigate a possibility of using InAs self-assembled quantum dots (SAQDs) to facilitate a coherent transfer of an energy encoded photon qubit into a spin qubit. We discuss the protocol of the spin qubit transfer between the two quantum dots of the device and show the results of fabrication and characterization of a hybrid device with a gate-defined double quantum dot (GDDD) tunnel coupled to a SAQD. We show an optical method that enables alignment of the two component quantum dots with an accuracy of 20 nm and analyze the proximity effect of the two components of the device on each other.