Horodecki, K;
Horodecki, M;
Horodecki, P;
Oppenheim, J;
(2005)
Secure key from bound entanglement.
Physical review letters
, 94
(16)
, Article 160502. 10.1103/PhysRevLett.94.160502.
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Abstract
We characterize the set of shared quantum states which contain a cryptographically private key. This allows us to recast the theory of privacy as a paradigm closely related to that used in entanglement manipulation. It is shown that one can distill an arbitrarily secure key from bound entangled states. There are also states that have less distillable private keys than the entanglement cost of the state. In general, the amount of distillable key is bounded from above by the relative entropy of entanglement. Relationships between distillability and distinguishability are found for a class of states which have Bell states correlated to separable hiding states. We also describe a technique for finding states exhibiting irreversibility in entanglement distillation.
| Type: | Article |
|---|---|
| Title: | Secure key from bound entanglement |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.94.160502 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.94.160502 |
| Language: | English |
| Additional information: | © 2005 The American Physical Society |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1362185 |
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