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- W2903424985 abstract "This work reports the functioning of a single atom energy-conversion device, operating either as a quantum engine or a refrigerator, coupled to a quantum load. The working fluid is comprised of two optical levels of a single ion, and the load is one vibrational mode of the same ion cooled down to the quantum regime. The energy scales of these two modes differ by 9 orders of magnitude. We realize cyclic energy transfers between the working fluid and the quantum load, either increasing or decreasing the population of the vibrational mode. This is achieved albeit the interaction between the load and the working fluid leads to a significant population redistribution and quantum correlations between them. The performance of the engine cycles as a function of several parameters is examined, and found to be in agreement with theory. We specifically look at the ergotropy of the load, which indicates the amount of energy stored in the load that can be extracted with a unitary process. We show that ergotropy rises with the number of engine cycles despite an increase in the entropy of the load. Our experiment represents the first fully quantum 4-stroke energy-conversion device operating with a generic coupling to a quantum load." @default.
- W2903424985 created "2018-12-11" @default.
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- W2903424985 date "2020-05-01" @default.
- W2903424985 modified "2023-10-03" @default.
- W2903424985 title "Single-atom energy-conversion device with a quantum load" @default.
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- W2903424985 doi "https://doi.org/10.1038/s41534-020-0264-6" @default.
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