Local correlations of mixed two-qubit states

The quantum probability distribution arising from single-copy von Neumann measurements on an arbitrary two-qubit state is decomposed into the local and nonlocal parts, in the approach of Elitzur, Popescu and Rohrlich [A. Elitzur, S. Popescu, and D. Rohrlich, Phys. Lett. A 162, 25 (1992)]. A lower bo...

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Bibliographic Details
Published in:arXiv.org 2011-12
Main Authors: Fu-Lin, Zhang, Jing-Ling, Chen, Chang-Liang, Ren, Ming-Jun, Shi
Format: Article
Language:English
Subjects:
Lower bounds
Quantum theory
Qubits (quantum computing)
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Online Access:Get full text
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Summary:The quantum probability distribution arising from single-copy von Neumann measurements on an arbitrary two-qubit state is decomposed into the local and nonlocal parts, in the approach of Elitzur, Popescu and Rohrlich [A. Elitzur, S. Popescu, and D. Rohrlich, Phys. Lett. A 162, 25 (1992)]. A lower bound of the local weight is proved being connected with the concurrence of the state \(p_L^{\max}= 1-\mathcal{C}(\rho)\). The local probability distributions for two families of mixed states are constructed independently, which accord with the lower bound.
ISSN:2331-8422
DOI:10.48550/arxiv.0909.1634