Thermal Quantum Machine. (arXiv:1904.06081v1 [cond-mat.mes-hall])

We study nanomachines whose relevant (effective) degrees of freedom N >> 1
but smaller than N of proteins. In these machines, both the entropic effect and
the quantum effect over the whole system play the essential roles in producing
nontrivial functions. We therefore call them thermal quantum machines (TQMs).
We propose a systematic protocol for designing the TQMs, which enables the
rough sketch, accurate design of equilibrium states, and accurate estimate of
response time. As an illustration, we design a novel TQM, which shows two
characteristic shapes. One can switch from one shape to the other by changing
temperature or by applying a pulsed external field. We discuss two potential
applications of this TQM.

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