Abstract
We characterize equilibrium states of quantum systems by a condition of passivity suggested by the second principle of thermodynamics. Ground states and β-KMS states for all inverse temperatures β≧0 are completely passive. We prove that these states are the only completely passive ones. For the special case of states describing pure phases, assuming the passivity we reproduce the results of Haag et al.
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Pusz, W., Woronowicz, S.L. Passive states and KMS states for general quantum systems. Commun.Math. Phys. 58, 273–290 (1978). https://doi.org/10.1007/BF01614224
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DOI: https://doi.org/10.1007/BF01614224