Quantum-enhanced absorption refrigerators

Abstract

Thermodynamics is a branch of science blessed by an unparalleled combination of generality of scope and formal simplicity. Based on few natural assumptions together with the four laws, it sets the boundaries between possible and impossible in macroscopic aggregates of matter. This triggered groundbreaking achievements in physics, chemistry and engineering over the last two centuries. Close analogues of those fundamental laws are now being established at the level of individual quantum systems, thus placing limits on the operation of quantum-mechanical devices. Here we study quantum absorption refrigerators, which are driven by heat rather than external work. We establish thermodynamic performance bounds for these machines and investigate their quantum origin. We also show how those bounds may be pushed beyond what is classically achievable, by suitably tailoring the environmental fluctuations via quantum reservoir engineering techniques. Such superefficient quantum-enhanced cooling realises a promising step towards the technological exploitation of autonomous quantum refrigerators.

12 pages, 4 figures. Published in Scientific Reports (NPG)

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• Enhancing the sensitivity of the LIGO gravitational wave detector by using squeezed states of light
• Single ion heat engine with maximum efficiency at maximum power
• Performance bound for quantum absorption refrigerators
• Minimal universal quantum heat machine
• Coefficient of performance at maximum figure of merit and its bounds for low-dissipation Carnot-like refrigerators

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