Private information via the Unruh effect

Details Private information via the Unruh effect Private information via the Unruh effect

2008-07-28

arxiv.org/abs/0807.4536v4

JHEP 0908:074,2009

Physics

Quantum Physics

5 pages. v2: footnote deleted and typos corrected. v3: major revision. New capacity (single-letter!) theorem and implicit assu

Scientific paper

10.1088/1126-6708/2009/08/074

In a relativistic theory of quantum information, the possible presence of horizons is a complicating feature placing restrictions on the transmission and retrieval of information. We consider two inertial participants communicating via a noiseless qubit channel in the presence of a uniformly accelerated eavesdropper. Owing to the Unruh effect, the eavesdropper's view of any encoded information is noisy, a feature the two inertial participants can exploit to achieve perfectly secure quantum communication. We show that the associated private quantum capacity is equal to the entanglement-assisted quantum capacity for the channel to the eavesdropper's environment, which we evaluate for all accelerations.

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