We study the question of how to decompose Hilbert space into a preferred tensor-product
factorization without any preexisting structure other than a Hamiltonian operator, in particular …

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 …

The term “decoherence” generally refers to the quantum process that supposedly turns a
pure state into a mixed state, which is diagonal in a well-defined basis. The orthodox …

According to a usual reading, decoherence is a process resulting from the interaction
between a small system and its large environment where information and energy are …

The special theory of relativity and quantum mechanics merge in the key principle of
quantum field theory, the principle of locality. We review some examples of its …

Let C be the set of all possible quantum states. We study the convex subsets of C with
attention focused on the lattice theoretical structure of these convex subsets and, as a result …

The works on decoherence due to spin baths usually agree in studying a one-spin system in
interaction with a large spin bath. In this paper we generalize those models by analyzing a …

We investigate entanglement for a composite closed system endowed with a scaling
property which allows the dynamics to be kept invariant while the effective Planck constant ℏ …

The problem of the classical limit of quantum mechanics consists in explaining how the
classical realm “emerges” from the quantum domain. Although along the history of quantum …

In this work we study the convex set of quantum states from a quantum logical point of view.
We consider an algebraic structure based on the convex subsets of this set. The relationship …