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33 papers
From Superradiance to Superabsorption: An Exact Treatment of Non-Markovian Cooperative Radiation
Ignacio González, Ángel Rivas
We investigate the emergence of cooperative radiation phenomena in ensembles of two-level atoms coupled to a lossy resonant cavity beyond the Markovian and mean-field approximation…
Correlated and Critical Phenomena in Multipartite Quantum Non-Markovianity
Ignacio González, Ángel Rivas
We study non-Markovianity in the exact dynamics of two two-level atoms in a resonant cavity. We find a critical behavior in the form of a Markovian to non-Markovian transition at a…
Unidirectional information flow and positive divisibility are nonequivalent notions of quantum Markovianity for noninvertible dynamics
Ángel Rivas
We construct a dynamical map which is not positive divisible and does not present information backflow either (as measured by trace norm quantifiers). It is formulated for a qutrit…
Robust nonequilibrium surface currents in the 3D Hofstadter model
Mark T. Mitchison, Ángel Rivas, Miguel A. Martin-Delgado
Genuinely two-dimensional robust crosscurrents -- which flow against the natural direction of heat flux -- have been missing since the discovery of their one-dimensional counterpar…
Robust nonequilibrium edge currents with and without band topology
Mark T. Mitchison, Ángel Rivas, Miguel A. Martin-Delgado
We study two-dimensional bosonic and fermionic lattice systems under nonequilibrium conditions corresponding to a sharp gradient of temperature imposed by two thermal baths. In par…
Relaxation times do not capture logical qubit dynamics
Amit Kumar Pal, Philipp Schindler, Alexander Erhard +5
Quantum error correction procedures have the potential to enable faithful operation of large-scale quantum computers. They protect information from environmental decoherence by sto…