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

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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• Impact of interface traps on charge noise, mobility and percolation density in Ge/SiGe heterostructures
• High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits
• Linear-in-momentum spin orbit interactions in planar Ge/GeSi heterostructures and spin qubits
• High-fidelity spin qubit shuttling via large spin-orbit interaction
• Phase driving hole spin qubits
• Geometry of the dephasing sweet spots of spin-orbit qubits
• Classification and magic magnetic-field directions for spin-orbit-coupled double quantum dots
• Determination of spin-orbit interaction in semiconductor nanostructures via non-linear transport
• Compromise-Free Scaling of Qubit Speed and Coherence
• Modelling of spin decoherence in a Si hole qubit perturbed by a single charge fluctuator
• Unifying Floquet theory of longitudinal and dispersive readout
• A photonic which-path entangler based on longitudinal cavity-qubit coupling
• A spinless spin qubit
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• Longitudinal coupling between electrically driven spin-qubits and a resonator
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• Quantification of the heavy-hole--light-hole mixing in two-dimensional hole gases
• Spin-photon interaction in a nanowire quantum dot with asymmetrical confining potential
• Cancelling second order frequency shifts in Ge hole spin qubits via bichromatic control
• Sweet-spot protection of hole spins in sparse arrays via spin-dependent magnetotunneling
• Switchable spin-photon coupling with hole spins in single-quantum dots