Entanglement witnesses and a loophole problem

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dc.creatorSkwara, Patrick
dc.creatorKampermann, Hermann
dc.creatorKleinmann, Matthias
dc.creatorBruss, Dagmar
dc.date2006-08-07
dc.date2007-07-18
dc.date.accessioned2026-07-07T08:18:52Z
dc.date.available2026-07-07T08:18:52Z
dc.descriptionWe consider a possible detector-efficiency loophole in experiments that detect entanglement via the local measurement of witness operators. Here, only local properties of the detectors are known. We derive a general threshold for the detector efficiencies which guarantees that a negative expectation value of a witness is due to entanglement, rather than to erroneous detectors. This threshold depends on the local decomposition of the witness and its measured expectation value. For two-qubit witnesses we find the local operator decomposition that is optimal with respect to closing the loophole.
dc.description5 pages, 2 figures, published version
dc.identifierhttps://arxiv.org/abs/quant-ph/0608058
dc.identifierhttp://arxiv.org/abs/quant-ph/0608058
dc.identifierPhys. Rev. A 76, 012312 (2007)
dc.identifierdoi:10.1103/PhysRevA.76.012312
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/134585
dc.subjectQuantum Physics
dc.titleEntanglement witnesses and a loophole problem
dc.typetext

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