Thermal entanglement and correlated coherence in two coupled double quantum dots systems

TL;DR

This paper analyzes how thermal entanglement and correlated coherence behave in two coupled double quantum dots, highlighting the influence of Coulomb interaction and temperature, and showing correlated coherence's robustness over entanglement.

Contribution

It provides analytical expressions for thermal concurrence and correlated coherence in coupled quantum dots, revealing their dependence on system parameters and their potential for quantum information applications.

Findings

Coulomb potential enhances thermal entanglement and coherence.

Correlated coherence captures all thermal entanglement at low temperatures.

Correlated coherence is more robust than thermal entanglement.

Abstract

In this work, we investigate the thermal quantum correlations in two coupled double semiconductor charge qubits. This is carried out by deriving analytical expressions for both the thermal concurrence and the correlated coherence. We study, in detail, the effects of the tunneling parameters, the Coulomb interaction and the temperature on the thermal entanglement and on the correlated coherence. It is found that the Coulomb potential plays an important role in the thermal entanglement and in the correlated coherence of the system. The results also indicate that the Coulomb potential can be used for significant enhancement of the thermal entanglement and quantum coherence. One interesting aspect is that the correlated coherence capture all the thermal entanglement at low temperatures, i.e, the local coherences are totally transferred to the thermal entanglement. Finally, we focus on the role played by thermal entanglement and the correlated coherence responsible for quantum correlations. We show that in all cases, the correlated coherence is more robust than the thermal entanglement so that quantum algorithms based only on correlated coherence may be more robust than those based on entanglement. Our results also show that the entanglement can be tuned by varying the Coulomb interaction between electrons.