Spin-polarized currents, used to control quantum states of single electron spins, can also control quantum states of qubits

https://phys.org/news/2024-06-alternative-quantum-states.html

"pentacene molecules (an aromatic hydrocarbon) on silver substrate previously coated with thin insulating magnesium oxide layer... electrons tunnel through gap from magnet on tip of tungsten needle to molecules, using quantum action... tunnel current spin-polarized... applied constant fast-oscillating voltage, inducing resonances ...spin transfer torque to create molecular spin quantum mechanical superposition states acting very locally steerable below nm... control quantum states of magnetic qubits in quantum devices"