Quantum states characterization for the zero-error capacity

Details Quantum states characterization for the zero-error capacity Quantum states characterization for the zero-error capacity

2006-11-03

arxiv.org/abs/quant-ph/0611042v2

Physics

Quantum Physics

submitted to J. Phys A. Needs IOP latex class files to compile

Scientific paper

The zero-error capacity of quantum channels was defined as the least upper bound of rates at which classical information can be transmitted through a quantum channel with probability of error equal to zero. This paper investigates some properties of input states and measurements used to attain the quantum zero-error capacity. We start by reformulating the problem of finding the zero-error capacity in the language of graph theory. This alternative definition is used to prove that the zero-error capacity of any quantum channel can be reached by using tensor products of pure states as channel inputs, and projective measurements in the channel output. We conclude by presenting an example that illustrates our results.

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