Quantum bath refrigeration towards absolute zero: unattainability principle challenged

  title={Quantum bath refrigeration towards absolute zero: unattainability principle challenged},
  author={Michal H. Kol'avr and David Gelbwaser-Klimovsky and Robert Alicki and Gershon Kurizki},
A minimal model of a quantum refrigerator (QR), i.e. a periodically phase-flipped two-level system permanently coupled to a finite-capacity bath (cold bath) and an infinite heat dump (hot bath), is introduced and used to investigate the cooling of the cold bath towards the absolute zero (T = 0). Remarkably, the temperature scaling of the cold-bath cooling rate reveals that it does not vanish as T → 0 for certain realistic quantized baths, e.g. phonons in strongly disordered media (fractons) or… 

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