Experimental Correlation-Boosted Quantum Engine

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Abstract
We design and experimentally implement a two-qubit quantum correlated SWAP heat engine that allows to achieve an efficiency above the standard Carnot limit, and to boost the amount of extractable work, in a wider qubit energy-gap ratio window, with respect to engine's cycle in the absence of initial qubit correlations. The boosted efficiency arises from a trade-off between the entropy production and the consumption of quantum correlations during the full thermodynamic cycle. We derive a generalized second-law limit and experimentally demonstrate the engine efficiency enhancement by tailoring the qubits effective energy gap and temperature, using an IBM quantum processor.

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