University of Basel Team Models Non-Perturbative Hamiltonians for Hole Spin Qubit Control

A thorough quantum geometrical description of hole spin qubits has been detailed by Zoltán György from the University of Basel and colleagues. The spin-orbit interaction, key for rapid electrical manipulation of qubits, originates from both the two-dimensional hole gas and in-plane confinement, each component displaying distinct characteristics. Their non-perturbative effective Hamiltonians, derived numerically for various low-dimensional hole systems including nanowires and heterostructures, accurately model qubit behaviour and reveal limitations to achieving perfect spin-orbit switching functionality. A meaningful definition of pseudospin applicable even far from the Γ-point is offered, providing a strong framework for understanding and optimising hole spin qubit performance. Scientists at the University of Basel, in collaboration with…