Dynamical polarization of the fermion parity in a nanowire Josephson junction

Understand

Josephson junctions in InAs nanowires proximitized with an Al shell can host gate-tunable Andreev bound states.

• Depending on the bound state occupation, the fermion parity of the junction can be even or odd.
• Coherent control of Andreev bound states has recently been achieved within each parity sector, but it is impeded by incoherent parity switches due to excess quasiparticles in the superconducting environment.
• Here, we show that we can polarize the fermion parity dynamically using microwave pulses by embedding the junction in a superconducting LC resonator.