Entropic singularities give rise to quantum transmission

Non-additivity of the quantum channel coherent information is known to occur in some very noisy channels, but its fundamental origin is unclear. Here, the author explains its link with log singularity of quantum entropy, and shows that it can also come up for low-noise channels.

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Autor principal: Vikesh Siddhu
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2021
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Q
Acceso en línea:https://doaj.org/article/614ee04c9b8e48dfb369cd0c23414d10
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Sumario:Non-additivity of the quantum channel coherent information is known to occur in some very noisy channels, but its fundamental origin is unclear. Here, the author explains its link with log singularity of quantum entropy, and shows that it can also come up for low-noise channels.