On Negativity and Quantum Fisher Information of an Open and Noisy System in the Steady State

TL;DR

This paper investigates the quantum Fisher information of an open, dissipative two-qubit system in steady state under noisy channels, revealing conditions where the system exhibits slight entanglement.

Contribution

It analyzes QFI in open, noisy quantum systems and identifies conditions for slight entanglement in steady states, which is a novel focus.

Findings

QFI per particle can be slightly greater than 1 under certain conditions

Both dephasing and non-dephasing channels can produce slight entanglement

Steady state systems can maintain quantum correlations despite noise

Abstract

In this work, we study the quantum Fisher information (QFI) per particle of an open (particles can enter and leave the system) and dissipative (far from thermodynamical equilibrium) steady state system of two qubits in noisy channels. We concentrate on two noisy channels these are dephasing and non-dephasing channels. We will show that under certain conditions QFI per particle is slightly greater than 1 for both systems. This means that both systems can be slightly entangled.