Abstract
We prove the Gibbs variational formula in terms of quantum relative entropy density that characterizes translation invariant thermal equilibrium states in quantum lattice systems. It is a natural quantum extension of the similar statement established by Föllmer for classical systems.
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Acknowledgements
I would like to thank Prof. Toshiyuki Toyoda for discussion on interplay between physics and information. Prof. Dénes Petz and Prof. Fumio Hiai told me their fundamental ideas of [5]. In particular, Prof. Hiai kindly sent me his private note explaining mathematical details.
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Communicated by Eric A. Carlen.
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Moriya, H. Gibbs Variational Formula for Thermal Equilibrium States in Terms of Quantum Relative Entropy Density. J Stat Phys 181, 761–771 (2020). https://doi.org/10.1007/s10955-020-02600-5
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DOI: https://doi.org/10.1007/s10955-020-02600-5