Journal
INTERNATIONAL JOURNAL OF QUANTUM INFORMATION
Volume 9, Issue 7-8, Pages 1701-1713Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0219749911008258
Keywords
Non-classical correlations; quantumness; entanglement generation
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Funding
- NSERC
- QuantumWorks
- CIFAR
- Ontario Centres of Excellence
- Spanish MICINN [FIS2008-01236/FIS, CONSOLIDER2006-00019]
- Generalitat de Catalunya through CIRIT [2009SGR-0985]
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In [Piani et al., PRL 106 (2011) 220403], 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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