Creation of quantum correlations between two atoms in a dissipative environment from an initial vacuum state

TL;DR

This paper explores how counter-rotating terms influence quantum correlations between two atoms in a lossy cavity, revealing steady states with high quantum discord but no entanglement, and how cavity decay affects these correlations.

Contribution

It demonstrates that counter-rotating terms can generate steady quantum discord in a dissipative environment, a novel insight into quantum correlation dynamics.

Findings

Counter-rotating terms lead to steady states with high quantum discord.

Steady states have no entanglement but exhibit quantum discord.

Increasing cavity decay rate can enhance and maximize steady quantum discord.

Abstract

We have investigated the effect of counter-rotating terms on the dynamics of entanglement and quantum discord between two identical atoms interacting with a lossy single mode cavity field for a system initially in a vacuum state. The counter-rotating terms are found to lead to steady states in the long time limit which can have high quantum discord, but have no entanglement. The effect of cavity decay rate on this steady state quantum discord has been also investigated, surprisingly, the increase in cavity decay rate is found to both enhance and maximize the steady quantum discord for separable states.