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  • Average entanglement dynamics in open two-qubit systems with continuous monitoring

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    Guevara68351-Accepted.pdf (1.155Mb)
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    Accepted Manuscript (AM)
    Author(s)
    Guevara, Ivonne
    Viviescas, Carlos
    Griffith University Author(s)
    Guevara Prieto, Ivonne A.
    Year published
    2014
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    Abstract
    We present a comprehensive implementation of the quantum trajectory theory for the description of the entanglement dynamics in a Markovian open quantum system made of two qubits. We introduce the average concurrence to characterize the entanglement in the system and derive a deterministic evolution equation for it that depends on the ways in which information is read from the environment. This buildt-in flexibility of the method is used to address two actual issues in quantum information: entanglement protection and entanglement estimation. We identify general physical situations in which an entanglement protection protocol ...
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    We present a comprehensive implementation of the quantum trajectory theory for the description of the entanglement dynamics in a Markovian open quantum system made of two qubits. We introduce the average concurrence to characterize the entanglement in the system and derive a deterministic evolution equation for it that depends on the ways in which information is read from the environment. This buildt-in flexibility of the method is used to address two actual issues in quantum information: entanglement protection and entanglement estimation. We identify general physical situations in which an entanglement protection protocol based on local monitoring of the environment can be implemented. Additionally, we methodically find unravelings of the system dynamics providing analytical tight bounds for the unmonitored entanglement in the system at all times. We conclude by showing the independence of the method from the choice of entanglement measure.
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    Journal Title
    Physical Review A
    Volume
    90
    DOI
    https://doi.org/10.1103/PhysRevA.90.012338
    Copyright Statement
    © 2014 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Mathematical sciences
    Physical sciences
    Quantum information, computation and communication
    Chemical sciences
    Publication URI
    http://hdl.handle.net/10072/66784
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    • Journal articles

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