Distributed correlations and information flows within a hybrid multipartite quantum-classical system

Giuseppe Compagno, Rosario Lo Franco, Rosario Lo Franco, Diogo O. Soares-Pinto, Bruno Leggio, Paweł Horodecki

Risultato della ricerca: Article

29 Citazioni (Scopus)

Abstract

Understanding the non-Markovian mechanisms underlying the revivals of quantum entanglement in the presence of classical environments is central in the theory of quantum information. Tentative interpretations have been given by either the role of the environment as a control device or the concept of hidden entanglement. We address this issue from an information-theoretic point of view. To this aim, we consider a paradigmatic tripartite system, already realized in the laboratory, made of two independent qubits and a random classical field locally interacting with one qubit alone. We study the dynamical relationship between the two-qubit entanglement and the genuine tripartite correlations of the overall system, finding that collapse and revivals of entanglement correspond, respectively, to the rise and fall of the overall tripartite correlations. Interestingly, entanglement dark periods can enable plateaux of nonzero tripartite correlations. We then explain this behavior in terms of information flows among the different parties of the system. Besides showcasing the phenomenon of the freezing of overall correlations, our results provide insights on the origin of retrieval of entanglement within a hybrid quantum-classical system.
Lingua originaleEnglish
pagine (da-a)1-8
Numero di pagine8
RivistaPHYSICAL REVIEW A
Volume92
Stato di pubblicazionePublished - 2015

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information flow
control equipment
freezing
retrieval
plateaus

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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Distributed correlations and information flows within a hybrid multipartite quantum-classical system. / Compagno, Giuseppe; Lo Franco, Rosario; Lo Franco, Rosario; Soares-Pinto, Diogo O.; Leggio, Bruno; Horodecki, Paweł.

In: PHYSICAL REVIEW A, Vol. 92, 2015, pag. 1-8.

Risultato della ricerca: Article

Compagno, Giuseppe ; Lo Franco, Rosario ; Lo Franco, Rosario ; Soares-Pinto, Diogo O. ; Leggio, Bruno ; Horodecki, Paweł. / Distributed correlations and information flows within a hybrid multipartite quantum-classical system. In: PHYSICAL REVIEW A. 2015 ; Vol. 92. pagg. 1-8.
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AU - Soares-Pinto, Diogo O.

AU - Leggio, Bruno

AU - Horodecki, Paweł

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N2 - Understanding the non-Markovian mechanisms underlying the revivals of quantum entanglement in the presence of classical environments is central in the theory of quantum information. Tentative interpretations have been given by either the role of the environment as a control device or the concept of hidden entanglement. We address this issue from an information-theoretic point of view. To this aim, we consider a paradigmatic tripartite system, already realized in the laboratory, made of two independent qubits and a random classical field locally interacting with one qubit alone. We study the dynamical relationship between the two-qubit entanglement and the genuine tripartite correlations of the overall system, finding that collapse and revivals of entanglement correspond, respectively, to the rise and fall of the overall tripartite correlations. Interestingly, entanglement dark periods can enable plateaux of nonzero tripartite correlations. We then explain this behavior in terms of information flows among the different parties of the system. Besides showcasing the phenomenon of the freezing of overall correlations, our results provide insights on the origin of retrieval of entanglement within a hybrid quantum-classical system.

AB - Understanding the non-Markovian mechanisms underlying the revivals of quantum entanglement in the presence of classical environments is central in the theory of quantum information. Tentative interpretations have been given by either the role of the environment as a control device or the concept of hidden entanglement. We address this issue from an information-theoretic point of view. To this aim, we consider a paradigmatic tripartite system, already realized in the laboratory, made of two independent qubits and a random classical field locally interacting with one qubit alone. We study the dynamical relationship between the two-qubit entanglement and the genuine tripartite correlations of the overall system, finding that collapse and revivals of entanglement correspond, respectively, to the rise and fall of the overall tripartite correlations. Interestingly, entanglement dark periods can enable plateaux of nonzero tripartite correlations. We then explain this behavior in terms of information flows among the different parties of the system. Besides showcasing the phenomenon of the freezing of overall correlations, our results provide insights on the origin of retrieval of entanglement within a hybrid quantum-classical system.

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