4.7 Article

Quantum capacity analysis of multi-level amplitude damping channels

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Partially Coherent Direct Sum Channels

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Summary: In this paper, we introduce the concept of Partially Coherent Direct Sum (PCDS) quantum channels as a generalization of known Direct Sum quantum channels. We provide necessary and sufficient conditions to identify degradable maps and simplify the quantum capacities. Interestingly, the special structure of PCDS allows for extending the computation of quantum capacity even for explicitly non-degradable quantum channels. Applications of the results to dephasing channels, amplitude damping channels, and combinations of the two are demonstrated.

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