Andreev spin qubits
Spinful Andreev levels can encode a qubit.
$$H_A=\frac{\hbar\omega_A}{2}\sigma_z+H_{\rm drive}$$
Physical intuition
Spinful Andreev levels can encode a qubit.
Deep dive: physical mechanism
Spin–orbit coupling and superconducting phase tune spin-dependent subgap states.
What is measured experimentally?
Microwave transitions and parity-resolved readout probe the qubit.
Assumptions, noise and limitations
Parity poisoning and subgap-state complexity complicate control.
Research and simulation exercise
Compare spin-split Andreev spectra at two phase biases.
Connect the ideas
Explore the chapter overview, learning path, and references.