We study the dynamics of heat flux in the thermalization process of a pair of identical quantum systems that interact dissipatively with a reservoir in a cascaded fashion. Despite that the open dynamics of the bipartite system S is globally Lindbladian, one of the subsystems "sees" the reservoir in a state modified by the interaction with the other subsystem and hence it undergoes a non-Markovian dynamics. As a consequence, the heat flow exhibits a nonexponential time behavior which can greatly deviate from the case where each party is independently coupled to the reservoir. We investigate both thermal and correlated initial states of S and show that the presence of correlations at the beginning can considerably affect the heat-flux rate. We carry out our study in two paradigmatic cases - a pair of harmonic oscillators with a reservoir of bosonic modes and two qubits with a reservoir of fermionic modes - and compare the corresponding behaviors. In the case of qubits and for initial thermal states, we find that the trace distance discord is at any time interpretable as the correlated contribution to the total heat flux.

Lorenzo, S., Farace, A., Ciccarello, F., Palma, G., Giovannetti, V. (2015). Heat flux and quantum correlations in dissipative cascaded systems. PHYSICAL REVIEW A, 91(2) [10.1103/PhysRevA.91.022121].

Heat flux and quantum correlations in dissipative cascaded systems

LORENZO, Salvatore;CICCARELLO, Francesco;PALMA, Gioacchino Massimo;
2015-02-25

Abstract

We study the dynamics of heat flux in the thermalization process of a pair of identical quantum systems that interact dissipatively with a reservoir in a cascaded fashion. Despite that the open dynamics of the bipartite system S is globally Lindbladian, one of the subsystems "sees" the reservoir in a state modified by the interaction with the other subsystem and hence it undergoes a non-Markovian dynamics. As a consequence, the heat flow exhibits a nonexponential time behavior which can greatly deviate from the case where each party is independently coupled to the reservoir. We investigate both thermal and correlated initial states of S and show that the presence of correlations at the beginning can considerably affect the heat-flux rate. We carry out our study in two paradigmatic cases - a pair of harmonic oscillators with a reservoir of bosonic modes and two qubits with a reservoir of fermionic modes - and compare the corresponding behaviors. In the case of qubits and for initial thermal states, we find that the trace distance discord is at any time interpretable as the correlated contribution to the total heat flux.
25-feb-2015
Settore FIS/03 - Fisica Della Materia
Lorenzo, S., Farace, A., Ciccarello, F., Palma, G., Giovannetti, V. (2015). Heat flux and quantum correlations in dissipative cascaded systems. PHYSICAL REVIEW A, 91(2) [10.1103/PhysRevA.91.022121].
File in questo prodotto:
File Dimensione Formato  
2015 PhysRevA.91.022121.pdf

Solo gestori archvio

Tipologia: Versione Editoriale
Dimensione 1.71 MB
Formato Adobe PDF
1.71 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/123975
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 46
  • ???jsp.display-item.citation.isi??? 44
social impact