How small can thermal machines be? The smallest possible refrigerator

Details How small can thermal machines be? The smallest possible refrigerator How small can thermal machines be? The smallest possible refrigerator

2009-08-14

arxiv.org/abs/0908.2076v2

Phys. Rev. Lett. 105, 130401 (2010)

Physics

Quantum Physics

6 pages, 7 figures. To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.105.130401

We investigate the fundamental dimensional limits to thermodynamic machines. In particular we show that it is possible to construct self-contained refrigerators (i.e. not requiring external sources of work) consisting of only a small number of qubits and/or qutrits. We present three different models, consisting of two qubits, a qubit and a qutrit with nearest-neighbour interactions, and a single qutrit respectively. We then investigate fundamental limits to their performance; in particular we show that it is possible to cool towards absolute zero.

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