Quantum memory as a perpetuum mobile? Stability v.s. reversibility of\n information processing

It is argued using a Gedankenexperiment that a scalable quantum memory could\nbe used as a perpetuum mobile of the second kind and hence cannot be realized\nin Nature. The reasoning is based on the assumption that the Landauer's\nprinciple for measurements is a consequence of the second law of thermodynamics\nand not an independent postulate. This implies a modification of the Landauer's\nprinciple when applied for discrimination of equilibrium (metastable) states.\nWhile identification of the metastable state can be done at the infinitesimally\nlow cost, a change of such a state involves dissipation of energy proportional\nto its stability factor.\n

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