Characterizing quantumness via entanglement creation

Details Characterizing quantumness via entanglement creation Characterizing quantumness via entanglement creation

2011-05-17

arxiv.org/abs/1105.3419v1

International Journal of Quantum Information 9(7 & 8):1701-1713, 2011

Physics

Quantum Physics

13 pages, 1 figure, submitted to special issue of IJQI

Scientific paper

10.1142/S021974991100825

In [M. Piani et al., arXiv:1103.4032 (2011)] an activation protocol was introduced which maps the general non-classical (multipartite) correlations between given systems into bipartite entanglement between the systems and local ancillae by means of a potentially highly entangling interaction. Here, we study how this activation protocol can be used to entangle the starting systems themselves via entanglement swapping through a measurement on the ancillae. Furthermore, we bound the relative entropy of quantumness (a naturally arising measure of non-classicality in the scheme of Piani et al. above) for a special class of separable states, the so-called classical-quantum states. In particular, we fully characterize the classical-quantum two-qubit states that are maximally non-classical.

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