Robustness of entanglement

Vidal, Guifre and Tarrach, Rolf (1999) Robustness of entanglement. Physical Review a, 59 1: 141-155. doi:10.1103/PhysRevA.59.141

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Author Vidal, Guifre
Tarrach, Rolf
Title Robustness of entanglement
Journal name Physical Review a   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 1999-01
Sub-type Article (original research)
DOI 10.1103/PhysRevA.59.141
Open Access Status File (Publisher version)
Volume 59
Issue 1
Start page 141
End page 155
Total pages 15
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Abstract 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.
Keyword Separability Criterion
Mixed States
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Engineering Publications
 
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