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Universal finite-time thermodynamics of many-body quantum machines from Kibble-Zurek scaling

Journal Article · · Physical Review Research
 [1];  [2];  [1];  [3]
  1. Indian Inst. of Technology, Palakkad (India)
  2. Indian Inst. of Science Education and Research, Berhampur (India)
  3. Donostia International Physics Center, San Sebastián (Spain); Basque Foundation for Science, Bilbao (Spain). IKERBASQUE; Univ. of Massachusetts, Boston, MA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
We demonstrate the existence of universal features in the finite-time thermodynamics of quantum machines by considering a many-body quantum Otto cycle in which the working medium is driven across quantum critical points during the unitary strokes. Specifically, we consider a quantum engine powered by dissipative energizing and relaxing baths. We show that under very generic conditions, the output work is governed by the Kibble-Zurek mechanism; i.e., it exhibits a universal power-law scaling with the driving speed through the critical points. We also optimize the finite-time thermodynamics as a function of the driving speed. The maximum power and the corresponding efficiency take a universal form, and are reached for an optimal speed that is governed by the critical exponents. We exemplify our results by considering a transverse-field Ising spin chain as the working medium. For this model, we also show how the efficiency and power vary as the engine becomes critical.
Research Organization:
Los Alamos National Laboratory (LANL), Los Allamos, NM (United States)
Sponsoring Organization:
USDOE; Science and Engineering Research Board (SERB) India
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1834523
Report Number(s):
LA-UR--20-22256
Journal Information:
Physical Review Research, Journal Name: Physical Review Research Journal Issue: 4 Vol. 2; ISSN 2643-1564
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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