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Title: Effect of the time-dependent coupling on a superconducting qubit-field system under decoherence: Entanglement and Wehrl entropy

The dynamics of a superconducting (SC) qubit interacting with a field under decoherence with and without time-dependent coupling effect is analyzed. Quantum features like the collapse–revivals for the dynamics of population inversion, sudden birth and sudden death of entanglement, and statistical properties are investigated under the phase damping effect. Analytic results for certain parametric conditions are obtained. We analyze the influence of decoherence on the negativity and Wehrl entropy for different values of the physical parameters. We also explore an interesting relation between the SC-field entanglement and Wehrl entropy behavior during the time evolution. We show that the amount of SC-field entanglement can be enhanced as the field tends to be more classical. The studied model of SC-field system with the time-dependent coupling has high practical importance due to their experimental accessibility which may open new perspectives in different tasks of quantum formation processing.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Mathematics Department, Faculty of Science, Sohag University, 82524 Sohag (Egypt)
  2. (Italy)
  3. The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, Miramare-Trieste (Italy)
  4. (IMSIU), College of Science, Department of Physics, Riyadh (Saudi Arabia)
  5. Department of Physics, McGill University, 3600 rue University, Montreal, QC, H3A 2T8 (Canada)
  6. (Canada)
Publication Date:
OSTI Identifier:
22451236
Resource Type:
Journal Article
Resource Relation:
Journal Name: Annals of Physics; Journal Volume: 361; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COUPLING; ENTROPY; POPULATION INVERSION; QUANTUM DECOHERENCE; QUANTUM ENTANGLEMENT; QUBITS; SUPERCONDUCTIVITY; TIME DEPENDENCE