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Coherence-assisted single-shot cooling by quantum absorption refrigerators

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A quantum absorption refrigerator is a cooling machine powered only by incoherent thermal energy. The simplest such device is composed of three qubits, one of which is the target to be cooled. I will discuss how quantum coherence in the three-qubit refrigerator enables cooling of the target qubit to temperatures lower than the steady state in a small amount of time. This potentially useful effect is due to the generic oscillations which appear in strongly coupled non-equilibrium quantum systems. I will also show that a quantum absorption refrigerator can be realised using a trapped ion in an optical cavity. We find that with realistic experimental parameters the ion can be cooled almost to its motional ground state using only freely available thermal energy in the form of sunlight.

This talk is part of the CQIF Seminar series.

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