How can you apply single-qubit gates in spin qubits?
There are several ways of applying single qubit gates to spin qubits:
- You can move the electron in a magnetic field gradient.
- You can apply a current in order to generate an AC magnetic field.
- You can send microwave signals matching the Larmor frequency of the qubit.
What determines the axis of rotation of the qubit in the Bloch sphere when applying a microwave signal?
The phase of the signal.