Universal coding for transmission of private information

Details Universal coding for transmission of private information Universal coding for transmission of private information

2010-07-15

arxiv.org/abs/1007.2629v3

J. Math. Phys. 51, 122202 (2010)

Physics

Quantum Physics

31 pages, no figures. Published version

Scientific paper

10.1063/1.3521499

We consider the scenario in which Alice transmits private classical messages to Bob via a classical-quantum channel, part of whose output is intercepted by an eavesdropper, Eve. We prove the existence of a universal coding scheme under which Alice's messages can be inferred correctly by Bob, and yet Eve learns nothing about them. The code is universal in the sense that it does not depend on specific knowledge of the channel. Prior knowledge of the probability distribution on the input alphabet of the channel, and bounds on the corresponding Holevo quantities of the output ensembles at Bob's and Eve's end suffice.

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