Quench dynamics of fermion-parity switches in a Josephson junction
We have investigated the phase-coherent, deterministic counterpart of incoherent, stochastic quasiparticle poisoning: A fermion-parity switch in a Josephson junction transfers a single quasiparticle into a metal contact, on demand and in a pure state. The quasiparticle is a coherent superposition of electron and hole, with a charge expectation value that can be adjusted between 0 and e. A charge-neutral quasiparticle is produced in the quenched limit of a fast parity switch, if the metal couples predominantly to a single Majorana operator in the Josephson junction. This level of control over Bogoliubov quasiparticles could be an asset for quantum information processing with superconducting electronics.
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