How to Maximize the Capacity of General Quantum Noisy Channels
arXiv:0810.1726 · doi:10.1002/prop.200900095
Abstract
A general quantum noisy channel is analyzed, wherein the transmitted qubits may experience symmetry-breaking decoherence, along with memory effects. We find the optimal basis not to be fully entangled, but a combination of factorized and partially-entangled states in the presence of memory, asymmetry and the state-bias of the noise. Capacity-maximization is shown to be achievable by combining temporal shaping of the transmitted qubits and optimal basis selection.
4 pages, 3 figures
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