SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 14: Materials and devices for quantum technology (joint session HL/TT)

HL 14.2: Talk

Wednesday, September 29, 2021, 10:30–10:45, H4

Natural heavy-hole flopping mode qubit in germanium — •Philipp M. Mutter and Guido Burkard — University of Konstanz, Konstanz, Germany

Flopping mode qubits in double quantum dots allow for coherent spin-photon hybridization and fast qubit gates when coupled to either an alternating external or a quantized cavity electric field. To achieve this, however, electronic systems rely on synthetic spin-orbit interaction by means of a magnetic field gradient as a coupling mechanism. Here we theoretically show that this challenging experimental setup can be avoided in heavy-hole systems in germanium by utilizing the sizable cubic Rashba spin-orbit interaction. We argue that the resulting natural flopping mode qubit possesses highly tunable spin coupling strengths that allow for qubit gate times in the nanosecond range when the system is designed to function in an optimal operation mode which we quantify.