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Witness for edge states and its characteristics

Source: Phys. Rev. A 80, 032331 (2009); doi:10.1103/PhysRevA.80.032331

Published 28 September 2009

KEYWORDS and PACS
Keywords
PACS
  • 03.67.Mn
    Entanglement measures, witnesses, and other characterizations (quantum information)
  • YEAR: 2009
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PUBLICATION DATA
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Nirman Ganguly1 and Satyabrata Adhikari2
1Heritage Institute of Technology, Kolkata 107, West Bengal, India
2S.N. Bose National Centre for Basic Sciences, Salt Lake, Kolkata 700098, West Bengal, India
Edge states lying at the edge of positive-partial-transpose- (PPT-) entangled states have a very intriguing existence and their detection is equally interesting. We present here a witness for detection of edge states. We then compare between our proposed witness operator and the witness operator proposed by Lewenstein et al. [Phys. Rev. A 62, 052310 (2000)] in terms of the efficiency in the detection of PPT entangled states. In this regard we show that this operator is finer than the operator of Lewenstein et al. in some restrictions. We also discuss about its experimental realization via Gell-Mann matrices. ©2009 The American Physical Society
History: Received 12 June 2009; published 28 September 2009
Permalink: http://link.aps.org/abstract/PRA/v80/e032331

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