The effect of nonequilibrium entropy production on the quantum Fisher information and correlations

TL;DR

This paper explores how nonequilibrium entropy production influences quantum Fisher information and correlations, revealing that thermodynamic costs can enhance quantum metrology under certain conditions, especially with weak tunneling.

Contribution

It demonstrates that nonequilibrium conditions and entropy production can be exploited to improve quantum Fisher information and correlations in open quantum systems, especially in weak tunneling regimes.

Findings

Nonequilibrium conditions enhance QFI and quantum correlations for weak tunneling.

Thermodynamic cost, via entropy production rate, assists in boosting quantum features.

Strong tunneling regimes show decay of QFI and correlations despite increased thermodynamic costs.

Abstract

In this study, we apply quantum master equations beyond secular approximation, and investigate the nonequilibrium thermodynamic cost of enhanced quantum metrology and quantum correlations. We find that the nonequilibrium conditions enhance quantum Fisher information (QFI) and quantum correlations predominantly for weak tunneling scenarios. The enhancement is assisted by a corresponding increase of the thermodynamic cost characterized by the entropy production rate (EPR). For the strong tunneling regimes, the QFI and quantum correlations can not be unceasingly boosted by higher thermodynamic costs and decay once the system is overburdened with extremely large energy currents. The result indicates that for open systems with weak tunneling rates, thermodynamic cost can be potentially exploited to improve the quantum metrology and quantum correlations.