Physics – Quantum Physics
Scientific paper
2005-06-29
Phys. Rev. A, 72, 052329 (2005)
Physics
Quantum Physics
9 pages, published version
Scientific paper
10.1103/PhysRevA.72.052329
A private shared Cartesian frame is a novel form of private shared correlation that allows for both private classical and quantum communication. Cryptography using a private shared Cartesian frame has the remarkable property that asymptotically, if perfect privacy is demanded, the private classical capacity is three times the private quantum capacity. We demonstrate that if the requirement for perfect privacy is relaxed, then it is possible to use the properties of random subspaces to nearly triple the private quantum capacity, almost closing the gap between the private classical and quantum capacities.
Bartlett Stephen D.
Hayden Patrick
Spekkens Robert W.
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