Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.78: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Coherent manipulation of GaAs quantum dot spin qubits using microwaves — •Ankita Choudhary1, Nand lal Sharma1, Moritz Langer1, Ghata Satish Bhayani1, Uri Vool2, and Caspar Hopfmann11Leibniz Institute for Solid State and Materials Research, Dresden — 2Max Planck Institute for Chemical Physics of Solids, Dresden

Spin qubits in semiconductor quantum dots are attractive resources for performing quantum computations. In these systems single optically addressable spin qubits can be realized by single confined charge carriers, electrons, heavy holes, and their excited states. The quantum dot spin qubit coherence is however limited due to their semiconductor environment due to spin-orbit coupling to the magnetic moments of the atomic nuclei. Our goal is to facilitate the heralded and deterministic spin state preparation as well as to minimize the decoherence. While the all-optical heralded preparation of spin states in GaAs quantum dots has been demonstrated by us [1], the latter may be achieved by coherent manipulation of the spin states using the spin echo technique [2]. Our immediate goal is therefore to enable coherent manipulation of quantum dot spin qubits via injection of microwave pulses by superconducting co-planar waveguide structures. This technique will allow us to achieve full manipulation of the quantum dot and we expect to be able to achieve strong interaction between microwaves and quantum dot spin qubits, which could enable the coherent coupling between superconducting and quantum dot qubits. [1] C. Hopfmann et al, PRB 104, 75301 (2021). [2]F. H. L. Koppens et al, PRL 100 (2008).

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