Phys. Rev. A 79, 032304 (2009) [4 pages]Nonsecret correlations can be used to distribute secrecyReceived 17 June 2008; published 5 March 2009 A counterintuitive result in entanglement theory was shown by Cubitt et al. Phys. Rev. Lett. 91 037902 (2003)], namely, that entanglement can be distributed by sending a separable state through a quantum channel. In this work, following an analogy between the entanglement and secret-key distillation scenarios, we derive its classical analog: secrecy can be distributed by sending nonsecret correlations through a private channel. This strengthens the close relation between entanglement and secrecy. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.79.032304
DOI:
10.1103/PhysRevA.79.032304
PACS:
03.67.Dd, 03.67.Mn, 03.65.Ud
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