Title:
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Robustness of entanglement
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Author:
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Vidal Bonafont, Guifré; Tarrach, R., 1948-
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Other authors:
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Universitat de Barcelona |
Abstract:
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In the quest to completely describe entanglement in the general case of a finite number of parties sharing a physical system of finite-dimensional Hilbert space an entanglement magnitude is introduced for its pure and mixed states: robustness. It corresponds to the minimal amount of mixing with locally prepared states which washes out all entanglement. It quantifies in a sense the endurance of entanglement against noise and jamming. Its properties are studied comprehensively. Analytical expressions for the robustness are given for pure states of two-party systems, and analytical bounds for mixed states of two-party systems. Specific results are obtained mainly for the qubit-qubit system (qubit denotes quantum bit). As by-products local pseudomixtures are generalized, a lower bound for the relative volume of separable states is deduced, and arguments for considering convexity a necessary condition of any entanglement measure are put forward. |
Subject(s):
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-Teoria quàntica -Teoria de la informació -Quantum information |
Rights:
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(c) The American Physical Society, 1999
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Document type:
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Article Article - Published version |
Published by:
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The American Physical Society
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