Regensburg 2022 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 30: Poster 2
HL 30.7: Poster
Thursday, September 8, 2022, 11:00–13:00, P3
Bright Electrically Controllable Quantum-Dot-Molecule Devices Fabricated by In Situ Electron-Beam Lithography — •Johannes Schall1, Marielle Deconinck1, Nikolai Bart2, Matthias Florian3, Martin von Helversen1, Christian Dangel4, Ronny Schmidt1, Lucas Bremer1, Frederik Bopp4, Isabell Hüllen3, Christopher Gies3, Dirk Reuter5, Andreas D. Wieck2, Sven Rodt1, Jonathan J. Finley4, Frank Jahnke3, Arne Ludwig2, and Stephan Reitzenstein1 — 1IFKP, TU Berlin, Germany — 2LS AFP, Ruhr-Universität Bochum, Germany — 3ITP, University of Bremen, Germany — 4WSI, TU München, Germany — 5Department Physik, Universität Paderborn, Germany
In quantum repeater networks it is of central importance to temporarily store and retrieve quantum information. Concepts based on quantum dot molecules (QDMs) promise storage times in excess of 1 ms. To make use of QDM based quantum memories, efficient coupling to flying qubits needs to be realized while maintaining precise electrical control. We report on the development of electrically tunable single-QDM devices with strongly enhanced broadband photon extraction efficiency. The quantum devices are based on stacked quantum dots in a pin-diode structure underneath a deterministically defined circular Bragg grating using in situ electron beam lithography. We determine the photon extraction efficiency, demonstrate bias voltage dependent spectroscopy and measure excellent single-photon emission properties. The metrics make the developed QDM device an attractive building block for use in future photonic quantum networks.