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Phys. Rev. Lett. 100, 140403 (2008) [4 pages]

Experimentally Friendly Geometrical Criteria for Entanglement

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Piotr Badzia̧g1,2,3, Časlav Brukner4,5, Wiesław Laskowski2, Tomasz Paterek4, and Marek Żukowski2
1Alba Nova Fysikum, University of Stockholm, S-106 91, Sweden
2Institute of Theoretical Physics and Astrophysics, University of Gdańsk, ul. Wita Stwosza 57, PL-80-952 Gdańsk, Poland
3National Quantum Information Centre of Gdańsk, ul. W. Andersa 27, PL-81-824 Sopot, Poland
4Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, Austria
5Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Vienna, Austria

Received 28 November 2007; revised 21 February 2008; published 8 April 2008

A simple geometrical criterion gives experimentally friendly sufficient conditions for entanglement. Its generalization gives a necessary and sufficient condition. It is linked with a family of entanglement identifiers, which is strictly richer than the family of entanglement witnesses.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.140403
DOI:
10.1103/PhysRevLett.100.140403
PACS:
03.65.Ud
 
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