Secret key distillation from shielded two-qubit states

Details Secret key distillation from shielded two-qubit states Secret key distillation from shielded two-qubit states

2008-03-03

arxiv.org/abs/0803.0345v2

Phys. Rev. A 81, 052320 (2010)

Physics

Quantum Physics

5 pages

Scientific paper

10.1103/PhysRevA.81.052320

The quantum states corresponding to a secret key are characterized using the so-called private states, where the key part consisting of a secret key is shielded by the additional systems. Based on the construction, it was shown that a secret key can be distilled from bound entangled states. In this work, I consider the shielded two-qubit states in a key-distillation scenario and derive the conditions under which a secret key can be distilled using the recurrence protocol or the two-way classical distillation, advantage distillation together with one-way postprocessing. From the security conditions, it is shown that a secret key can be distilled from bound entangled states in a much wider range. In addition, I consider the case that in which white noise is added to quantum states and show that the classical distillation protocol still works despite a certain amount of noise although the recurrence protocol does not.

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