Characterizing quantumness via entanglement creation

Abstract

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.

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

References in corpus (9)

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Cited by in corpus (22)

• The classical-quantum boundary for correlations: discord and related measures
• Measuring Quantum Coherence with Entanglement
• Measures and applications of quantum correlations
• Converting Nonclassicality into Entanglement
• Are general quantum correlations monogamous?
• Negativity of quantumness and its interpretations
• Creating quantum correlations through local non-unitary memoryless channels
• Unification of different views of decoherence and discord
• Experimental entanglement activation from discord in a programmable quantum measurement
• Quantifying non-classicality with local unitary operations
• Complementary sequential measurements generate entanglement
• Quantumness of correlations, quantumness of ensembles and quantum data hiding
• Quantumness of correlations in indistinguishable particles
• Quantifying dynamical coherence with dynamical entanglement
• Genuine Distributed Coherence
• Relation between Quantum Coherence and Quantum Entanglement in Quantum Measurements
• Predominance of entanglement of formation over quantum discord under quantum channels
• General quantum correlation from nonreal values of Kirkwood-Dirac quasiprobability over orthonormal product bases
• Maximally discordant separable two qubit $X$ states
• Additivity relations in quantum correlations
• Distributing quantum correlations through local operations and classical resources
• Characterising two-sided quantum correlations beyond entanglement via metric-adjusted f-correlations