Dynamics of entanglement among the environment oscillators of many-body systems

TL;DR

This paper analytically investigates the entanglement dynamics among environment oscillators in a many-body harmonic system, revealing conditions for maximal entanglement and excitation transfer over time.

Contribution

It extends previous work by analyzing the dynamical entanglement among environment oscillators in a many-body system with an analytical approach.

Findings

Concurrence reaches one when excitations in partitions are equal.

Environment oscillators become entangled over long times.

Excitations transfer completely from the main oscillator to the environment.

Abstract

In this work we extend the discussion that was began in the Ref. [A. L. de Paula Jr., J. G. G. de Oliveira Jr., J. G. Peixoto de Faria, Dagoberto S. Freitas and M. C. Nemes, {\it Phys. Rev.} {\bf A89}, (2014) 022303] to deal with the dynamics of the concurrence of a many-body system. In that previous paper, the discussion was focused in the residual entanglement between the partitions of the system. The purpose of the present contribution is to shed some light on the dynamical properties of entanglement among the environment oscillators. We consider a system consisting of a harmonic oscillator linearly coupled to N others and solve the corresponding dynamical problem analytically. We divide the environment in arbitrary two partitions and the entanglement dynamics between any of these partitions is quantified and it shows that in the case that excitations in each partitions are equal, the concurrence reaches the value one and the two partition of the environment are maximally entangled. For long times the excitations of the main oscillator are completely transferred to environment and the environment oscillators are found entangled.