Asymptotic dynamics of the alternate degrees of freedom for a two-mode system: an analytically solvable model

TL;DR

This paper investigates how different decompositions of a two-mode quantum system evolve asymptotically, revealing that environmental influence uniquely determines a classical-like, locally affected structure.

Contribution

It provides a theoretical explanation for why certain subsystem structures are physically relevant based on environmental effects in an analytically solvable model.

Findings

Only one structure exhibits classical-like behavior.

Environmental influence determines the physically relevant subsystem decomposition.

Asymptotic dynamics favor a specific, locally influenced structure.

Abstract

The composite systems can be non-uniquely decomposed into parts (subsystems). Not all decompositions (structures) of a composite system are equally physically relevant. In this paper we answer on theoretical ground why it may be so. We consider a pair of mutually un-coupled modes in the phase space representation that are subjected to the independent quantum amplitude damping channels. By investigating asymptotic dynamics of the degrees of freedom, we find that the environment is responsible for the structures non-equivalence. Only one structure is distinguished by both locality of the environmental in uence on its subsystems and a classical-like description.