Bipartite entanglement dynamics of two-level systems in sub-Ohmic reservoirs

TL;DR

This paper investigates how two-level quantum systems become entangled when interacting with sub-Ohmic reservoirs, revealing conditions that support entanglement even under non-ideal and noisy environments.

Contribution

It provides the first numerically exact analysis of bipartite entanglement dynamics in sub-Ohmic reservoirs, highlighting their role in sustaining entanglement in non-Markovian settings.

Findings

Bipartite entanglement persists across broad parameter ranges.

Entanglement creation is highly sensitive to initial reservoir states.

Entanglement survives thermal noise and broken symmetries.

Abstract

The quantum dynamics of pairs of two level systems immersed in dissipative reservoirs with sub-Ohmic spectral distributions is studied by means of numerically exact path integral Monte Carlo methods. It is shown that this class of reservoirs, relevant for generic properties of strongly non-Markovian environments with possible realizations in solid state structures at cryogenic temperatures, supports bipartite entanglement in broad ranges of parameter space and even for broken symmetries and in presence of thermal noise. The sensitivity of creation of entanglement in non-equilibrium on initial preparations of the reservoir is investigated in detail.