Quasiparticle Poisoning of Majorana Qubits

Qubits based on Majorana zero modes are a promising path towards topological quantum computing. Such qubits, though, susceptible to quasiparticle poisoning which does not have be small by argument. We study the main sources of relevant for realistic devices -- non-equilibrium above-gap quasiparticles and equilibrium localized subgap states. Depending parameters system architecture qubit either these can dominate decoherence. However, we find in contrast naive estimates that moderately disordered, floating islands timescales exceeding seconds.