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• W4289713053 abstract "A key objective of quantum information theory is to understand quantum channels and their capacities. Here we study a remarkably simple, low-dimensional, single-parameter family of quantum channels with exotic quantum information-theoretic features. We focus on the simplest example from this family, a qutrit-to-qutrit channel intuitively obtained by hybridizing together a simple degradable channel with a completely useless qubit channel. Such hybridizing makes this channel’s capacities behave in a variety of interesting ways. For instance, the private and classical capacity of this channel coincide and can be explicitly calculated, even though the channel lies outside any previous class with calculable capacities. Moreover, the quantum capacity of the channel can be computed explicitly, given a clear and compelling conjecture is true. This spin alignment conjecture, which may be of independent interest, is proved in certain special cases and backed numerically in certain other cases. Finally, we generalize the qutrit channel; the resulting channels and their capacities display similarly rich behavior. Our companion paper [22] demonstrates superadditivity when transmitting quantum information jointly across our qutrit channel used with a variety of assisting channels, in a manner unknown before." @default.
• W4289713053 created "2022-08-04" @default.
• W4289713053 creator A5033192808 @default.
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• W4289713053 date "2022-06-26" @default.
• W4289713053 modified "2023-09-26" @default.
• W4289713053 title "The platypus of the quantum channel zoo" @default.
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• W4289713053 doi "https://doi.org/10.1109/isit50566.2022.9834678" @default.
• W4289713053 hasPublicationYear "2022" @default.
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