Entanglement oscillation and survival induced by non-Markovian decoherence dynamics of entangled squeezed-state

TL;DR

This paper investigates how non-Markovian environmental effects influence the entanglement dynamics of two optical fields in entangled squeezed states, revealing conditions for entanglement survival due to environmental backaction.

Contribution

It provides an exact analysis of non-Markovian decoherence effects on entangled squeezed states, highlighting the dual roles of backaction and dissipation in entanglement evolution.

Findings

Residual entanglement can survive in steady state due to environmental backaction.

The environmental correlation time scale critically affects entanglement dynamics.

Backaction can counteract dissipation when correlation time matches system change time.

Abstract

We study the exact decoherence dynamics of the entangled squeezed state of two single-mode optical fields interacting with two independent and uncorrelated environments. We analyze in detail the non-Markovian effects on the entanglement evolution of the initially entangled squeezed state for different environmental correlation time scales. We find that the environments have dual actions on the system: backaction and dissipation. In mparticular, when the environmental correlation time scale is comparable to the time scale for significant change in the system, the backaction would counteract the dissipative effect. Interestingly, this results in the survival of some residual entanglement in the final steady state.