The fundamental excitations in superconductors - Bogoliubov quasiparticles can be either a resource or liability superconducting devices: they are what enables photon detection microwave kinetic inductance detectors, but source of errors qubits and electron pumps. To improve operation the latter devices, ways to mitigate quasiparticle effects have been devised; particular, combining different m...

We study the fermionic quasiparticle spectrum in a zero-temperature superfluid Fermi gas, and particular how it is modified by different disintegration processes. On top of emission collective boson ($1\to2$, subject previous study, PRL 124, 073404), we consider here events where three quasiparticles are emitted ($1\to3$). show that both processes described $t$-matrix self-energy (as well as so...

Landau developed the idea of quasiparticle excitations in the context of interacting Fermi systems. His theory is known as Fermi liquid theory. He introduced the idea phenomenologically, and later Abrikosov and Kalatnikov gave a formal derivation using diagrammatic perturbation theory to all orders. Landau suggested describing the excited states of the interacting system as in one-to-one corres...

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 ...

We study the dynamics of relaxation and thermalization in an exactly solvable model with the goal of understanding the effects of off-shell processes. The focus is to compare the exact evolution of the distribution function with different approximations to the relaxational dynamics: Boltzmann, non-Markovian and Markovian quantum kinetics. The time evolution of the occupation number or distribut...