Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 30: Poster 2

HL 30.7: Poster

Donnerstag, 8. September 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.