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HL: Fachverband Halbleiterphysik

HL 37: Poster IV

HL 37.13: Poster

Mittwoch, 20. März 2024, 18:00–20:30, Poster F

Towards optical interfaces to spin qubits with epitaxial GaAs quantum dots — •Selma Delić^1,2, Xuelin Jin^1,2, Sebastian Kindel², Paola Atkinson³, Natalia Demarina⁴, Hendrik Bluhm², Hans-Georg Babin⁵, Arne Ludwig⁵, Nils von den Driesch^1,6, Alexander Pawlis^1,6, Detlev Grützmacher^1,2, and Beata Kardynał^1,2 — ¹Peter Grünberg Institut (PGI) 9, Forschungszentrum (FZ) Jülich, 52428 Jülich — ²Department of Physics, RWTH, 52074 Aachen — ³Institut des Nano Sciences de Paris, CNRS UMR 7588, Sorbonne Université, 75005 Paris — ⁴PGI 2, FZ Jülich — ⁵Lehrstuhl für angewandte Festkörperphysik, Ruhr-Universität Bochum, 44780 Bochum — ⁶PGI 10, FZ Jülich

Singlet-triplet (S-T) qubits created in gate-defined quantum dots (GDQD) at the GaAs/AlGaAs interface are promising candidates in quantum information processing. Due to the absence of hole confinement, S-T qubits cannot be directly coupled coherently to photonic qubits, which can be information carriers in quantum networks. One solution to this problem is coupling a GDQD to an epitaxial QD.

In this contribution, we show the design of heterostructures to fabricate optical interfaces to spin qubits in GaAs. We present the status of the optical and electrical characteristics of heterostructure wafers and the status of the device fabrication, focusing on the progress in spatial alignment of the two types of QDs. Using atomic force microscopy imaging, we show that the alignment can be realised by identifying and locating defects on the heterostructure's surface, which originate from the growth of GaAs QDs through local droplet etching.

Keywords: quantum dots; spin qubits; quantum communication