The separability versus entanglement problem
arXiv:1701.02187
Abstract
We present a review of the problem of finding out whether a quantum state of two or more parties is entangled or separable. After a formal definition of entangled states, we present a few criteria for identifying entangled states and introduce some entanglement measures. We also provide a classification of entangled states with respect to their usefulness in quantum dense coding, and present some aspects of multipartite entanglement.
Review article, overlaps with arXiv:quant-ph/0508032, 32 pages, 7 figures