Journal
PHYSICAL REVIEW A
Volume 78, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.78.062105
Keywords
information theory; protocols; quantum entanglement
Categories
Funding
- EU
- ESF PESC
- Spanish MEC [FIS 2005-04627, FIS2007-60182]
- Consolider Ingenio 2010
- Grup Consolidat de Recerca de la Generalitat de Catalunya, Caixa Manresa
- Fundacao para a Ciencia e a Tecnologia (Portugal) [SFRH/BD/21915/2005]
- IT R&D program of MKE/IITA [2008-F-035-01]
- Ministry of Education, Science & Technology (MoST), Republic of Korea [CG028201] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Fundação para a Ciência e a Tecnologia [SFRH/BD/21915/2005] Funding Source: FCT
- ICREA Funding Source: Custom
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Structural approximations to positive, but not completely positive maps are approximate physical realizations of these nonphysical maps. They find applications in the design of direct entanglement-detection methods. We show that many of these approximations, in the relevant case of optimal positive maps, define an entanglement breaking channel and, consequently, can be implemented via a measurement and state-preparation protocol. We also show how our findings can be useful for the design of better and simpler direct entanglement detection methods.
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