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Propagation of nonclassical correlations across a quantum spin chain (Articolo in rivista)

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Propagation of nonclassical correlations across a quantum spin chain (Articolo in rivista) (literal)

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Alternative label

Campbell S. (1,2,3); Apollaro T.J.G. (4); Di Franco C. (2); Banchi L. (4,5); Cuccoli R. (4,5); Vaia R. (6); Plastina F. (7,8); Paternostro M. (1) (2011)
Propagation of nonclassical correlations across a quantum spin chain
in Physical review. A; American Physical Society (APS), College Pk (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Campbell S. (1,2,3); Apollaro T.J.G. (4); Di Franco C. (2); Banchi L. (4,5); Cuccoli R. (4,5); Vaia R. (6); Plastina F. (7,8); Paternostro M. (1) (literal)

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1) Centre for Theoretical Atomic, Molecular and Optical Physics, School of Mathematics and Physics, Queen's University, Belfast UK BT7 1NN, Ireland, United Kingdom 2) Physics Department, University College Cork, Cork, Republic of Ireland 3) Quantum Systems Unit, Okinawa Institute of Science and Technology, Okinawa, Japan 4) Dipartimento di Fisica e Astronomia, Università di Firenze, Via G. Sansone 1, IT-50019 Sesto Fiorentino (FI), Italy 5) INFN Sezione di Firenze, via G.Sansone 1, IT-50019 Sesto Fiorentino (FI), Italy 6) Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, via Madonna del Piano 10, IT-50019 Sesto Fiorentino (FI), Italy 7) Dipartimento di Fisica, Università della Calabria, IT-87036 Arcavacata di Rende (CS), Italy 8) INFN Gruppo collegato di Cosenza, Universita della Calabria, IT-87036, Arcavacata di Rende (CS), Italy (literal)

Titolo

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. (literal)

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