Estimating multipartite entanglement measures

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.022307· OSTI ID:21408199

Osterloh, Andreas ^[1]; Hyllus, Philipp ^[1]

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1. Institut fuer theoretische Physik, Leibniz Universitaet Hannover, D-30167 Hannover (Germany)

We investigate the lower bound obtained from experimental data of a quantum state {rho}, as proposed independently by O. Guehne et al. [Phys. Rev. Lett. 98, 110502 (2007)] and J. Eisert et al. [New J. Phys. 9, 46 (2007)], and apply it to mixed states of three qubits. The measure we consider is the convex-roof extended three-tangle. Our findings highlight an intimate relation to lower bounds obtained recently from so-called characteristic curves of a given entanglement measure. We apply the bounds to estimate the three-tangle present in recently performed experiments aimed at producing a three-qubit Greenberger-Horne-Zeilinger (GHZ) state. A nonvanishing lower bound is obtained if the GHZ fidelity of the produced states is larger than 3/4.

• OSTI ID: 21408199
• Journal Information: Physical Review. A, Vol. 81, Issue 2; Other Information: DOI: 10.1103/PhysRevA.81.022307; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DIAGRAMS
GHZ RANGE
MIXED STATE
QUANTUM ENTANGLEMENT
QUBITS
FREQUENCY RANGE
INFORMATION
QUANTUM INFORMATION