Géza Tóth et al 2009 New J. Phys. 11 083002 doi:10.1088/1367-2630/11/8/083002
Practical methods for witnessing genuine multi-qubit entanglement in the vicinity of symmetric states
Géza Tóth1,2,3,7, Witlef Wieczorek4,5, Roland Krischek4,5, Nikolai Kiesel4,5,6, Patrick Michelberger4,5 and Harald Weinfurter4,5
Show affiliationsWe present general numerical methods to construct witness operators for entanglement detection and estimation of the fidelity. Our methods are applied to detecting entanglement in the vicinity of a six-qubit Dicke state with three excitations and also to further entangled symmetric states. All our witnesses are designed to keep the measurement effort small. We also present general results on the efficient local decomposition of permutationally invariant operators, which makes it possible to measure projectors to symmetric states efficiently.
- This article was modified on 20 August 2009 to correct a typing error in reference [45].
- PACS
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03.67.Lx Quantum computation architectures and implementations
03.65.Ta Foundations of quantum mechanics; measurement theory
- Subjects
- Dates
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Issue 8 (August 2009)
Received 26 March 2009
Published 4 August 2009
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Practical methods for witnessing genuine multi-qubit entanglement in the vicinity of symmetric states
Géza Tóth et al 2009 New J. Phys. 11 083002
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-
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-
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Dust, fertilization and sources
Lorraine A Remer 2006 Environ. Res. Lett. 1 011001
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O Ambacher 1998 J. Phys. D: Appl. Phys. 31 2653
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