Dynamics of quantum correlations in colored-noise environments (Articolo in rivista)

Type
Label
  • Dynamics of quantum correlations in colored-noise environments (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevA.87.052328 (literal)
Alternative label
  • Benedetti C. [ 1 ] ; Buscemi F. [ 2 ] ; Bordone P. [ 3,4 ] ; Paris M. G. A. [ 5,1 ] (2013)
    Dynamics of quantum correlations in colored-noise environments
    in Physical review. A; AMER CHEMICAL SOC, WASHINGTON (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Benedetti C. [ 1 ] ; Buscemi F. [ 2 ] ; Bordone P. [ 3,4 ] ; Paris M. G. A. [ 5,1 ] (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 87 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • [ 1 ] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy [ 2 ] Univ Bologna, E De Castro Adv Res Ctr Elect Syst ARCES, I-40125 Bologna, Italy [ 3 ] Univ Modena & Reggio Emilia, Dipartimento Sci Fis Informat & Matemat, I-41125 Modena, Italy [ 4 ] CNR Ist Nanosci, Ctr S3, I-41125 Modena, Italy [ 5 ] CNISM Udr Milano, I-20133 Milan, Italy (literal)
Titolo
  • Dynamics of quantum correlations in colored-noise environments (literal)
Abstract
  • We address the dynamics of entanglement and quantum discord for two noninteracting qubits initially prepared in a maximally entangled state and then subjected to a classical colored noise, i.e., coupled with an external environment characterized by a noise spectrum of the form 1/f(alpha). More specifically, we address systems in which the Gaussian approximation fails, i.e., mere knowledge of the spectrum is not enough to determine the dynamics of quantum correlations. We thus investigate the dynamics for two different configurations of the environment: in the first case, the noise spectrum is due to the interaction of each qubit with a single bistable fluctuator with an undetermined switching rate, whereas in the second case we consider a collection of classical fluctuators with fixed switching rates. In both cases, we found analytical expressions for the time dependence of entanglement and quantum discord, which may also be extended to a collection of fluctuators with random switching rates. The environmental noise is introduced by means of stochastic time-dependent terms in the Hamiltonian, and this allows us to describe the effects of both separate and common environments. We show that the non-Gaussian character of the noise may lead to significant effects, e.g., environments with the same power spectrum, but different configurations give rise to the opposite behavior for quantum correlations. In particular, depending on the characteristics of the environmental noise considered, both entanglement and discord display either a monotonic decay or the phenomena of sudden death and revivals. Our results show that the microscopic structure of the environment, in addition to its noise spectrum, is relevant for the dynamics of quantum correlations and may be a valid starting point for the engineering of non-Gaussian colored environments. (literal)
Editore
Prodotto di
Autore CNR

Incoming links:


Autore CNR di
Prodotto
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi
Editore di
data.CNR.it