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Title: On the operation of machines powered by quantum non-thermal baths

Diverse models of engines energised by quantum-coherent, hence non-thermal, baths allow the engine efficiency to transgress the standard thermodynamic Carnot bound. These transgressions call for an elucidation of the underlying mechanisms. Here we show that non-thermal baths may impart not only heat, but also mechanical work to a machine. The Carnot bound is inapplicable to such a hybrid machine. Intriguingly, it may exhibit dual action, concurrently as engine and refrigerator, with up to 100% efficiency. Here, we conclude that even though a machine powered by a quantum bath may exhibit an unconventional performance, it still abides by the traditional principles of thermodynamics.
 [1] ;  [2] ;  [3] ;  [1]
  1. Weizmann Inst. of Science, Rehovot (Israel). Dept. of Chemical Physics
  2. Harvard Univ., Cambridge, MA (United States). Dept. of Chemistry and Chemical Biology
  3. Weizmann Inst. of Science, Rehovot (Israel). Dept. of Chemical Physics; RIKEN, Saitama (Japan)
Publication Date:
Grant/Contract Number:
SC0001088; SC0001088 (energy conversion pro
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 18; Journal Issue: 8; Journal ID: ISSN 1367-2630
IOP Publishing
Research Org:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; quantum thermodynamics; heat engine; non-passivity; open quantum system
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1280198; OSTI ID: 1436299