Superactivation, unlockability, and secrecy distribution of bound information
arXiv:1011.2120 · doi:10.1103/PhysRevA.83.042336
Abstract
Bound information, a cryptographic classical analogue of bound entanglement, is defined as classical secret correlations from which no secret key can be extracted. Its existence was conjectured and shown in a multipartite case. In this work, we provide a new example of bound information in a four-partite scenario. Later, using this example, we prove that bound information can be superactivated in a finite-copy scenario and unlockable. We also show that bound entangled states (bound information) can be used to distribute multipartite pure-state entanglement (secret key).
7 pages, 2 figures
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