Entanglement, the property responsible for the “spooky action at a distance” disliked by Einstein, is a now verified property of composed quantum systems. It is actually at the core of quantum information processing.
Depending on the interplay between preparations and measurements, correlations of quantum states display several quantum features, differing both quantitatively and qualitatively.
We work towards the (operational) characterization, detection, quantification, and exploitation of entanglement and of other forms of the quantumness of correlations.
Quantum Entanglement, R. Horodecki et al., Rev. Mod. Phys. 81, 865 (2009)
Bell nonlocality, N. Brunner et al., Rev. Mod. Phys. 86, 419 (2014)
Quantumness of correlations, quantumness of ensembles and quantum data hiding, M. Piani et al., New J. Phys. in press, arXiv:1405.1640 (2014)