Influence of Initial Entangled States on the Temperature-Dependent CHSH Inequality

TL;DR

This paper investigates how temperature influences the violation of the CHSH inequality in two-qubit systems, revealing that certain initial states maintain temperature independence while others have a temperature threshold for inequality validity.

Contribution

It demonstrates the impact of initial entangled states and temperature on CHSH inequality validity, highlighting the role of decoherence-free subspaces in quantum correlations.

Findings

CHSH inequality remains temperature-independent for initial states in DFS

Other entangled states show a temperature threshold for inequality validity

Temperature affects the violation of CHSH inequality in open bipartite systems

Abstract

We demonstrate that the temperature affects the validity of the CHSH inequality in an open bipartite two-qubit system. Specifically, for initial entangled states within the decoherence-free subspace (DFS), the CHSH inequality remains temperature-independent. In contrast, other entangled states exhibit a temperature threshold beyond which the inequality holds.