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arXiv · 2204.00404

Tunable hole spin-photon interaction based on g-matrix modulation

V. P. Michal·J. C. Abadillo-Uriel·S. Zihlmann·R. Maurand·Y. -M. Niquet·M. Filippone
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Abstract

We consider a spin circuit-QED device where a superconducting microwave resonator is capacitively coupled to a single hole confined in a semiconductor quantum dot. Thanks to the strong spin-orbit coupling intrinsic to valence-band states, the gyromagnetic g-matrix of the hole can be modulated electrically. This modulation couples the photons in the resonator to the hole spin. We show that the applied gate voltages and the magnetic-field orientation enable a versatile control of the spin-photon interaction, whose character can be switched from fully transverse to fully longitudinal. The longitudinal coupling is actually maximal when the transverse one vanishes and vice-versa. This "reciprocal sweetness" results from geometrical properties of the g-matrix and protects the spin against dephasing or relaxation. We estimate coupling rates reaching ~ 10 MHz in realistic settings and discuss potential circuit-QED applications harnessing either the transverse or the longitudinal spin-photon interaction. Furthermore, we demonstrate that the g-matrix curvature can be used to achieve parametric longitudinal coupling with enhanced coherence.

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V. P. Michal, J. C. Abadillo-Uriel, S. Zihlmann, R. Maurand, Y. -M. Niquet, M. Filippone. 2022-04-01. Tunable hole spin-photon interaction based on g-matrix modulation. https://doi.org/10.1103/physrevb.107.l041303

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