Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 64: Poster II
HL 64.11: Poster
Thursday, March 19, 2020, 10:00–13:00, P1A
Photoluminescence (PL) spectroscopy of a droplet self-assembled quantum dot (SAQD) coupled to a quantum well — •Christine Barthelmes1, David Ficker1, Zheng Zeng1, Hendrik Bluhm2, and Kardynal Beata1 — 1Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Germany — 2JARA-Institute for Quantum Information, RWTH Aachen University, Germany
Realisation of the full potential of quantum networks depends on the ability to send photon qubits between quantum processors separated by long distances. One of the challenges of such a network is interfacing scalable qubits with photonic qubits. A viable protocol to transfer a quantum state between a photonic qubit and electrically controlled spin qubit in a GaAs/AlGaAs heterostructure has been recently proposed. In the protocol a GaAs/AlGaAs gate-defined double quantum (GDQD) hosts the spin qubit and it is tunnel coupled to a SAQD, which serves as a photon qubit receiver. Here, we present the results of optimization of the electron transfer process between the SAQD grown using droplet epitaxy and the quantum well (QW) in which the GDQD is to be defined. We tune the relative energies of electronic states in the In(Ga)As QD and the QW to achieve electron tunneling between them. Based on the time-energy uncertainty principle, we measure the competing processes of radiative recombination and carrier tunneling escape from the homogenous linewidth in PL of selected SAQDs. Furthermore, we explore this effect for different spacer distances between the SAQDs and the QWs to tune the tunnel coupling, which is necessary to achieve high fidelity coherent spin transfer in the hybrid device under development.