Reservoir engineering for maximally efficient quantum engines
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2020
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We employ reservoir engineering technique to build an artificial thermal bath at arbitrary (effective) negative
and positive temperatures for a single spin system. The required interaction engineering is achieved by applying
a specific sequence of radio-frequency pulses using nuclear magnetic resonance, while the temperature of the
bath can be controlled by appropriate preparation of the initial 1H nuclear spin state. This artificial reservoir
allowed us to implement a single qubit quantum engine that operates at a single reservoir at effective negative
temperature and with maximum efficiency, independent of the unitary transformation performed on the qubit
system, as long as it changes the qubit state. We measured the population of the carbon spin and the efficiency
of our quantum engine, which are in very good agreement with the predicted results.
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MENDONÇA, Taysa M.; SOUZA, Alexandre M.; ASSIS, Rogério J. de; ALMEIDA, Norton G. de; SARTHOUR, Roberto S.; OLIVEIRA, Ivan S.; VILLAS-BOAS, Celso J. Reservoir engineering for maximally efficient quantum engines. Physical Review Research, New York, v. 2, e043419, 2020. DOI: 10.1103/PhysRevResearch.2.043419. Disponível em: https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.2.043419. Acesso em: 4 maio 2023.