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Title: Propagation of nonclassical correlations across a quantum spin chain

Abstract

We study the transport of quantum correlations across a chain of interacting spin-1/2 particles. As a quantitative figure of merit, we choose a symmetric version of quantum discord and compare it with the transported entanglement, addressing various operating regimes of the spin medium. Discord turns out to be better transported for a wide range of working points and initial conditions of the system. We relate this behavior to the efficiency of propagation of a single excitation across the spin chain. Moreover, we point out the role played by a magnetic field in the dynamics of discord in the effective channel embodied by the chain. Our analysis can be interestingly extended to transport processes in more complex networks and the study of nonclassical correlations under general quantum channels.

Authors:
 [1];  [2];  [3]; ;  [2];  [4];  [5];  [1]
  1. Centre for Theoretical Atomic, Molecular and Optical Physics, School of Mathematics and Physics, Queen's University, Belfast BT7 1NN, Northern Ireland (United Kingdom)
  2. Dipartimento di Fisica e Astronomia, Universita di Firenze, Via G. Sansone 1, IT-50019 Sesto Fiorentino (Italy)
  3. Physics Department, University College Cork, Cork, Republic of Ireland (Ireland)
  4. Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, via Madonna del Piano 10, IT-50019 Sesto Fiorentino (Italy)
  5. Dipartimento di Fisica, Universita della Calabria, IT-87036 Arcavacata di Rende (Italy)
Publication Date:
OSTI Identifier:
22093485
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 5; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPARATIVE EVALUATIONS; CORRELATIONS; EXCITATION; FERMIONS; MAGNETIC FIELDS; QUANTUM ENTANGLEMENT; QUANTUM MECHANICS; SPIN; SYMMETRY

Citation Formats

Campbell, S., Physics Department, University College Cork, Cork, Quantum Systems Unit, Okinawa Institute of Science and Technology, Okinawa, Apollaro, T. J. G., Di Franco, C., Banchi, L., Cuccoli, A., INFN Sezione di Firenze, via G.Sansone 1, IT-50019 Sesto Fiorentino, Vaia, R., Plastina, F., INFN Gruppo collegato di Cosenza, Universita della Calabria, IT-87036, Arcavacata di Rende, and Paternostro, M. Propagation of nonclassical correlations across a quantum spin chain. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.052316.
Campbell, S., Physics Department, University College Cork, Cork, Quantum Systems Unit, Okinawa Institute of Science and Technology, Okinawa, Apollaro, T. J. G., Di Franco, C., Banchi, L., Cuccoli, A., INFN Sezione di Firenze, via G.Sansone 1, IT-50019 Sesto Fiorentino, Vaia, R., Plastina, F., INFN Gruppo collegato di Cosenza, Universita della Calabria, IT-87036, Arcavacata di Rende, & Paternostro, M. Propagation of nonclassical correlations across a quantum spin chain. United States. https://doi.org/10.1103/PHYSREVA.84.052316
Campbell, S., Physics Department, University College Cork, Cork, Quantum Systems Unit, Okinawa Institute of Science and Technology, Okinawa, Apollaro, T. J. G., Di Franco, C., Banchi, L., Cuccoli, A., INFN Sezione di Firenze, via G.Sansone 1, IT-50019 Sesto Fiorentino, Vaia, R., Plastina, F., INFN Gruppo collegato di Cosenza, Universita della Calabria, IT-87036, Arcavacata di Rende, and Paternostro, M. Tue . "Propagation of nonclassical correlations across a quantum spin chain". United States. https://doi.org/10.1103/PHYSREVA.84.052316.
@article{osti_22093485,
title = {Propagation of nonclassical correlations across a quantum spin chain},
author = {Campbell, S. and Physics Department, University College Cork, Cork and Quantum Systems Unit, Okinawa Institute of Science and Technology, Okinawa and Apollaro, T. J. G. and Di Franco, C. and Banchi, L. and Cuccoli, A. and INFN Sezione di Firenze, via G.Sansone 1, IT-50019 Sesto Fiorentino and Vaia, R. and Plastina, F. and INFN Gruppo collegato di Cosenza, Universita della Calabria, IT-87036, Arcavacata di Rende and Paternostro, M.},
abstractNote = {We study the transport of quantum correlations across a chain of interacting spin-1/2 particles. As a quantitative figure of merit, we choose a symmetric version of quantum discord and compare it with the transported entanglement, addressing various operating regimes of the spin medium. Discord turns out to be better transported for a wide range of working points and initial conditions of the system. We relate this behavior to the efficiency of propagation of a single excitation across the spin chain. Moreover, we point out the role played by a magnetic field in the dynamics of discord in the effective channel embodied by the chain. Our analysis can be interestingly extended to transport processes in more complex networks and the study of nonclassical correlations under general quantum channels.},
doi = {10.1103/PHYSREVA.84.052316},
url = {https://www.osti.gov/biblio/22093485}, journal = {Physical Review. A},
issn = {1050-2947},
number = 5,
volume = 84,
place = {United States},
year = {2011},
month = {11}
}