Entanglement dynamics and relaxation in a few-qubit system interacting with random collisions (Articolo in rivista)

Type
Label
  • Entanglement dynamics and relaxation in a few-qubit system interacting with random collisions (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Gennaro, G; Benenti, G; Palma, GM (2008)
    Entanglement dynamics and relaxation in a few-qubit system interacting with random collisions
    in Europhysics letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Gennaro, G; Benenti, G; Palma, GM (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 82 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[Gennaro, G.; Palma, G. M.] Univ Palermo, NEST, CNR, INFM, I-90123 Palermo, Italy; [Gennaro, G.; Palma, G. M.] Univ Palermo, Dipartimento Sci Fisiche & Astron, I-90123 Palermo, Italy; [Benenti, G.] Univ Insubria, CNISM, CNR, INFM, I-22100 Como, Italy; [Benenti, G.] Univ Insubria, Ctr Nonlinear & Complex Syst, I-22100 Como, Italy; [Benenti, G.] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy (literal)
Titolo
  • Entanglement dynamics and relaxation in a few-qubit system interacting with random collisions (literal)
Abstract
  • The dynamics of a single qubit interacting by a sequence of pairwise collisions with an environment consisting of just two more qubits is analyzed. Each collision is modeled in terms of a random unitary operator with a uniform probability distribution described by the uniform Haar measure. We show that the purity of the system qubit as well as the bipartite and the tripartite entanglement reach time-averaged equilibrium values characterized by large instantaneous fluctuations. These equilibrium values are independent of the order of collision among the qubits. The relaxation to equilibrium is analyzed also in terms of an ensemble average of random collision histories. Such average allows for a quantitative evaluation and interpretation of the decay constants. Furthermore a dependence of the transient dynamics on the initial degree of entanglement between the environment qubits is shown to exist. Finally the statistical properties of bipartite and tripartite entanglement are analyzed. Copyright (c) EPLA, 2008. (literal)
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