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Title: Tunneling, decoherence, and entanglement of two spins interacting with a dissipative bath

Abstract

We use numerically exact iterative path integral methods to investigate the decoherence and entanglement dynamics of a tunneling pair of two coupled qubits (spins) system interacting with a dissipative bath. We find that decoherence is generally accompanied by the destruction of entanglement, although the specifics of this destruction depend sensitively on the parameters of the Hamiltonian (qubit-qubit coupling and/or energy bias), the strength of dissipation, the temperature, and the choice of initial condition. We also observe that dissipation can in some cases generate a substantial amount of entanglement. Finally, if an entangled eigenstate exists which does not couple to the environment, the long-time entanglement can significantly exceed the value corresponding to the Boltzmann equilibrium state.

Authors:
 [1];  [1]
  1. Department of Physics, University of Illinois, 1110 W. Green Street, Urbana, Illinois 61801 (United States)
Publication Date:
OSTI Identifier:
22105431
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 138; Journal Issue: 11; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COUPLING; EIGENFUNCTIONS; EIGENVALUES; HAMILTONIANS; INTEGRAL EQUATIONS; ITERATIVE METHODS; PATH INTEGRALS; QUANTUM COMPUTERS; QUANTUM ENTANGLEMENT; QUBITS; SPIN; TUNNEL EFFECT

Citation Formats

Sahrapour, Mohammad M., Makri, Nancy, and Department of Chemistry, University of Illinois, 600 S. Goodwin Avenue, Urbana, Illinois 61801. Tunneling, decoherence, and entanglement of two spins interacting with a dissipative bath. United States: N. p., 2013. Web. doi:10.1063/1.4795159.
Sahrapour, Mohammad M., Makri, Nancy, & Department of Chemistry, University of Illinois, 600 S. Goodwin Avenue, Urbana, Illinois 61801. Tunneling, decoherence, and entanglement of two spins interacting with a dissipative bath. United States. https://doi.org/10.1063/1.4795159
Sahrapour, Mohammad M., Makri, Nancy, and Department of Chemistry, University of Illinois, 600 S. Goodwin Avenue, Urbana, Illinois 61801. 2013. "Tunneling, decoherence, and entanglement of two spins interacting with a dissipative bath". United States. https://doi.org/10.1063/1.4795159.
@article{osti_22105431,
title = {Tunneling, decoherence, and entanglement of two spins interacting with a dissipative bath},
author = {Sahrapour, Mohammad M. and Makri, Nancy and Department of Chemistry, University of Illinois, 600 S. Goodwin Avenue, Urbana, Illinois 61801},
abstractNote = {We use numerically exact iterative path integral methods to investigate the decoherence and entanglement dynamics of a tunneling pair of two coupled qubits (spins) system interacting with a dissipative bath. We find that decoherence is generally accompanied by the destruction of entanglement, although the specifics of this destruction depend sensitively on the parameters of the Hamiltonian (qubit-qubit coupling and/or energy bias), the strength of dissipation, the temperature, and the choice of initial condition. We also observe that dissipation can in some cases generate a substantial amount of entanglement. Finally, if an entangled eigenstate exists which does not couple to the environment, the long-time entanglement can significantly exceed the value corresponding to the Boltzmann equilibrium state.},
doi = {10.1063/1.4795159},
url = {https://www.osti.gov/biblio/22105431}, journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 11,
volume = 138,
place = {United States},
year = {Thu Mar 21 00:00:00 EDT 2013},
month = {Thu Mar 21 00:00:00 EDT 2013}
}