Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 75: Poster IIIB
HL 75.19: Poster
Thursday, March 19, 2020, 15:00–17:30, P2/3OG
Towards a fully electrically tunable entangled photon source — •Zheng Zeng1, Arne Ludwig2, Marcel Schmidt2, Beata Kardynał1, and Feng Liu3 — 1Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum, Germany — 3JARA-Institute for Quantum Information, RWTH Aachen University, 52074 Aachen, Germany
An entangled photon source (EPS) is one of the key components for optical quantum computing and quantum network. Bright sources of entangled photon pairs have already demonstrated using In(Ga)As self-assembled quantum dots (QDs). However, their scalability and entanglement fidelity are limited by the broad energy distribution and energy splitting between bright exciton states (fine structure splitting (FSS)). In this work, we aim to develop a fully electrical tunable on-demand EPS based on InAs QDs. Simultaneous tuning of the QD transition energy and FSS is essential to achieve this goal. To this end, we fabricated devices with a full back gate and split front gates. We measured the tuning of the QD transition energy by electric field along the QD growth direction via the quantum Stark effect and the tuning of the FSS by the in-plane electric field. Our results strongly indicate that our device can be potentially used as a fully electrically tunable EPS.