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We present a model for an autonomous quantum thermal machine comprised of twoqubits capable of manipulating and even amplifying the local coherence in anon-degenerate external system. The machine uses only thermal resources,namely, contact with two heat baths at different temperatures, and the externalsystem has a non-zero initial amount of coherence. The method we propose allowsfor an interconversion between energy, both work and heat, and coherence in anautonomous configuration working in out-of-equilibrium conditions. This modelraises interesting questions about the role of fundamental limitations ontransformations involving coherence and opens up new possibilities in themanipulation of coherence by autonomous thermal machines.

Autonomous thermal machine for amplification and control of energetic coherence