Non-Markovian evolution: a quantum walk perspective

Understand

Quantum non-Markovianity of a quantum noisy channel manifests typically as information backflow, characterized by the departure of the intermediate map from complete positivity, though we indicate certain noisy channels that don't exhibit this behavior.

• In complex systems, non-Markovianity becomes more involved on account of subsystem dynamics.
• Here we study various facets of non-Markovian evolution, in the context of coined quantum walks, with particular stress on disambiguating the internal vs.
• environmental contributions to non-Markovian backflow.