A quantum cellular automaton (QCA) is an abstract model consisting of an array of finite-
dimensional quantum systems that evolves in discrete time by local unitary operations. Here …

Reduced density matrices are a powerful tool in the analysis of entanglement structure,
approximate or coarse-grained dynamics, decoherence, and the emergence of classicality. It …

As a universal theory of physics, quantum mechanics must assign states to every level of
description of a system—from a full microscopic description all the way up to an effective …

The common idea behind complexity reduction in physical systems is separation of
information into “physically meaningful” and “safely ignorable.” Here we consider a generic …

We consider tests of Leggett-Garg's macrorealism and of macroscopic local realism, where
for spacelike separated measurements the assumption of macroscopic noninvasive …

The characterization of physical systems relies on the observable properties which are
measured, and how such measurements are performed. Here we analyze two ways of …

Our knowledge of quantum mechanics can satisfactorily describe simple microscopic
systems, but is yet to explain the macroscopic everyday phenomena we observe. Here we …

Entropy production is the crucial quantity characterizing irreversible phenomena and the
second law of thermodynamics. Yet, a ubiquitous definition eludes consensus. Given that …

In the present article, we explore a suitable coarse-graining channel as a tool to describe
effective entanglement spreading in a coarse-grained spin chain with different degrees of …

Using the quantum map formalism, we provide a framework to construct fuzzy and coarse-
grained quantum maps of many-body systems that account for limitations in the resolution of …