scholarly journals Quantum heat engines: Limit cycles and exceptional points

2018 ◽  
Vol 97 (6) ◽  
Author(s):  
Andrea Insinga ◽  
Bjarne Andresen ◽  
Peter Salamon ◽  
Ronnie Kosloff
Keyword(s):  
Limit Cycles ◽  
Exceptional Points ◽  
Heat Engines ◽  
Quantum Heat Engines

scholarly journals Thermodynamic Uncertainty Relation in Slowly Driven Quantum Heat Engines

2021 ◽  
Vol 126 (21) ◽  
Author(s):  
Harry J. D. Miller ◽  
M. Hamed Mohammady ◽  
Martí Perarnau-Llobet ◽  
Giacomo Guarnieri
Keyword(s):  
Uncertainty Relation ◽  
Heat Engines ◽  
Quantum Heat Engines

scholarly journals The maximum efficiency of nano heat engines depends on more than temperature

Quantum ◽  
2019 ◽  
Vol 3 ◽  
pp. 177 ◽  
Author(s):  
Mischa P. Woods ◽  
Nelly Huei Ying Ng ◽  
Stephanie Wehner
Keyword(s):  
Second Law Of Thermodynamics ◽  
Maximum Efficiency ◽  
Second Law ◽  
Single Shot ◽  
Free Energies ◽  
Heat Engines ◽  
A Value ◽  
Quantum Protocols ◽  
Additional Constraints ◽  
Quantum Heat Engines

Sadi Carnot's theorem regarding the maximum efficiency of heat engines is considered to be of fundamental importance in thermodynamics. This theorem famously states that the maximum efficiency depends only on the temperature of the heat baths used by the engine, but not on the specific structure of baths. Here, we show that when the heat baths are finite in size, and when the engine operates in the quantum nanoregime, a revision to this statement is required. We show that one may still achieve the Carnot efficiency, when certain conditions on the bath structure are satisfied; however if that is not the case, then the maximum achievable efficiency can reduce to a value which is strictly less than Carnot. We derive the maximum efficiency for the case when one of the baths is composed of qubits. Furthermore, we show that the maximum efficiency is determined by either the standard second law of thermodynamics, analogously to the macroscopic case, or by the non increase of the max relative entropy, which is a quantity previously associated with the single shot regime in many quantum protocols. This relative entropic quantity emerges as a consequence of additional constraints, called generalized free energies, that govern thermodynamical transitions in the nanoregime. Our findings imply that in order to maximize efficiency, further considerations in choosing bath Hamiltonians should be made, when explicitly constructing quantum heat engines in the future. This understanding of thermodynamics has implications for nanoscale engineering aiming to construct small thermal machines.

Performance projections for functional CO2laser coupled quantum heat engines

2004 ◽  
Vol 51 (16-18) ◽  
pp. 2713-2725 ◽  
Author(s):  
Alan E. Hill ◽  
Yuri V. Rostovtsev ◽  
Marlan O. Scully
Keyword(s):  
Heat Engines ◽  
Quantum Heat Engines

scholarly journals Cooperative efficiency boost for quantum heat engines

2019 ◽  
Vol 99 (2) ◽  
Author(s):  
David Gelbwaser-Klimovsky ◽  
Wassilij Kopylov ◽  
Gernot Schaller
Keyword(s):  
Heat Engines ◽  
Quantum Heat Engines

scholarly journals Magnetically-Driven Quantum Heat Engines: The Quasi-Static Limit of Their Efficiency

Entropy ◽  
2016 ◽  
Vol 18 (5) ◽  
pp. 173 ◽  
Author(s):  
Enrique Muñoz ◽  
Francisco Peña ◽  
Alejandro González
Keyword(s):  
Static Limit ◽  
Heat Engines ◽  
Quantum Heat Engines
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