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Converting Nonclassicality into Entanglement. N. Killoran, F. Steinh and n. M. Plenio in Phys. Rev. Lett. 116:080402 (2016).  What the paper says!?

This text addresses important question such as «What is special about the nonclassical states of a physical system, and what distinguishes them from the more commonplace classical states?»

Requires further study.