The coherent information of Pauli channels with coded inputs

Details The coherent information of Pauli channels with coded inputs The coherent information of Pauli channels with coded inputs

2009-09-23

arxiv.org/abs/0909.4115v2

Physics

Quantum Physics

6 pages, 2 figures

Scientific paper

The calculating of the coherent information is a fundamental step in obtaining the quantum capacity of a quantum channel. We introduce orthogonal and complete code basis to evaluate the coherent information per channel use when the input is the maximal mixture of stabilizer codewords. In the code basis, the output density matrix is diagonal, the joint output of the system and the auxiliary is block diagonal. The coherent information is worked out by counting the weights of error operators.

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