Entanglement Dissipation: Unitary and Non-unitary Processes

TL;DR

This paper explores how both unitary and non-unitary dissipative processes affect entanglement, highlighting that unitary dissipation can be reversible and useful for entanglement creation, while some entangled states remain invariant.

Contribution

It clarifies the roles of unitary and non-unitary dissipation in entanglement dynamics, emphasizing the potential of reversible processes for entanglement generation.

Findings

Unitary dissipation is reversible and useful for entanglement production.

Certain entangled states remain invariant despite non-unitary dissipation.

Reversible processes can be harnessed for entanglement manipulation.

Abstract

Dissipative processes in physics are usually associated with non-unitary actions. However, the important resource of entanglement is not invariant under general unitary transformations, and is thus susceptible to unitary "dissipation". In this note we discuss both unitary and non-unitary dissipative processes, showing that the former is ultimately of value, since reversible, and enables the production of entanglement; while even in the presence of the latter, more conventional non-unitary and non-reversible, process there exist nonetheless invariant entangled states.