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Pang, Arthur O T; Lupu-Gladstein, Noah; Ferretti, Hugo; Yilmaz, Y Batuhan; Brodutch, Aharon; Steinberg, Aephraim M
arXiv (Cornell University), 09/2023Paper, Journal Article
Information capacity enhancement through the coherent control of channels has attracted much attention of late, with work exploring the effect of coherent control of channel causal orders, channel superpositions, and information encoding. Coherently controlling channels necessitates a non-trivial expansion of the channel description, which for superposing qubit channels, is equivalent to expanding the channel to act on qutrits. Here we explore the nature of this capacity enhancement for the superposition of channels by comparing the maximum coherent information through depolarizing qubit channels and relevant superposed and qutrit channels. We show that the expanded qutrit channel description in itself is sufficient to explain the capacity enhancement without any use of superposition.
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