Decoherence-free subspace and disentanglement dynamics for two qubits in a common non-Markovian squeezed reservoir

TL;DR

This paper investigates how non-Markovian effects influence entanglement and decoherence in two qubits interacting with a common squeezed reservoir, revealing differences from Markovian behavior and effects of finite temperature.

Contribution

It demonstrates the differences in entanglement dynamics between non-Markovian and Markovian regimes and extends analysis to squeezed thermal baths.

Findings

Non-Markovian entanglement dynamics differ significantly from Markovian case.

Some decoherence free states remain free in both regimes, others do not.

Finite bath temperature affects entanglement evolution.

Abstract

We study the non-Markovian entanglement dynamics of two qubits in a common squeezed bath. We see remarkable difference between the non-Markovian entanglement dynamics with its Markovian counterpart. We show that a non-Markovian decoherence free state is also decoherence free in the Markovian regime, but all the Markovian decoherence free states are not necessarily decoherence free in the non-Markovian domain. We extend our calculation from squeezed vacuum bath to squeezed thermal bath, where we see the effect of finite bath temperatures on the entanglement dynamics.