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Unified approach to geometric and positive-map-based non-linear entanglement identifiers

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arxiv 1802.00806 v1 pith:MCL2LLID submitted 2018-02-02 quant-ph

Unified approach to geometric and positive-map-based non-linear entanglement identifiers

classification quant-ph
keywords entanglementidentifierscriteriageometricmapsrelationtypesallows
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Detecting quantumness of correlations (especially entanglement) is a very hard task even in the simplest case i.e. two-partite quantum systems. Here we provide an analysis whether there exists a relation between two most popular types of entanglement identifiers: the first one based on positive maps and not directly applicable in laboratory and the second one --- geometric entanglement identifier which is based on specific Hermiticity-preserving maps. We show a profound relation between those two types of entanglement criteria. Hereunder we have proposed a general framework of nonlinear functional entanglement identifiers which allows us to construct new experimentally friendly entanglement criteria.

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