Yao Lu

Qubit is the building block of a quantum computer. We propose to realize an Andreev spin qubit in a superconducting junction with spin fields. The localized Andreev bound states with energies far below the superconducting gap split to spin 1/2 states that form the basis of the Andreev spin qubit. We show that this Andreev spin qubit features spin-dependent inductance, enabling the readout of the spin states. Furthermore, we demonstrate the existence of at least two sweet spots, which is important for quantum computing. We also discuss different systems that host the Andreev spin qubit.