# Superstatistics and quantum entanglement in the isotropic spin-1/2 XX dimer from a nonadditive thermodynamics perspective.

@article{CastaoYepes2021SuperstatisticsAQ, title={Superstatistics and quantum entanglement in the isotropic spin-1/2 XX dimer from a nonadditive thermodynamics perspective.}, author={Jorge David Casta{\~n}o-Yepes and Cristian Felipe Ramirez-Gutierrez}, journal={Physical review. E}, year={2021}, volume={104 2-1}, pages={ 024139 } }

In this paper, the impact of temperature fluctuations in the entanglement of two qubits described by a spin-1/2 XX model is studied. To describe the out-of-equilibrium situation, superstatistics is used with fluctuations given by a χ^{2}-distribution function, and its free parameters are chosen in such a way that resembles the nonadditive Tsallis thermodynamics. In order to preserve the Legendre structure of the thermal functions, particular energy constraints are imposed on the density…

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