Quantum dynamics

Political science

Superconductivity

Multipartite

Quantum mechanics

Quantum system

Statistical physics

Quantum process

Quantum entanglement

Quantum discord

Quasiparticle

Quantum

Unitary state

Delocalized electron

Physics

Physical review. B./Physical review. B

We analyze the dynamics of entanglement in a paradigmatic noninteracting system subject to continuous monitoring of the local excitation densities. Recently, it was conjectured that the evolution of quantum correlations in such system is described by a semiclassical theory, based on entangled pairs of ballistically propagating quasiparticles and inspired by the hydrodynamic approach to unitary (integrable) quantum systems. Here, however, we show that this conjecture does not fully capture the complex behavior of quantum correlations emerging from the interplay between coherent dynamics and continuous monitoring. We unveil the existence of multipartite quantum correlations which are inconsistent with an entangled-pair structure and which, within a quasiparticle picture, would require the presence of larger multiplets. We also observe that quantum information is highly delocalized, as it is shared in a collective nonredundant way among adjacent regions of the many-body system. Our results shed light onto the be...

Entangled multiplets and spreading of quantum correlations in a continuously monitored tight-binding chain