A crossed multi-copy pairing of entanglement witnesses detects entangled states that the individual witnesses and the standard same-copy pairing fail to detect.
Lower Bounds of Entanglement Quantifiers Based On Entanglement Witnesses
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abstract
To quantify the entanglement of bipartite systems in terms of some entanglement measure is a challenging problem in general, and it is much worse when the information about the system is less. In this manuscript, based on two classes of entanglement criteria, we present a method to obtain the lower bounds of the entanglement measures, concurrence, entanglement of formation, and geometrical entanglement measure.
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Witness based nonlinear detection of quantum entanglement
A crossed multi-copy pairing of entanglement witnesses detects entangled states that the individual witnesses and the standard same-copy pairing fail to detect.