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- W3101967395 abstract "Expressions of several capacity regions in quantum information theory involve an optimization over auxiliary quantum registers. Evaluating such expressions requires bounds on the dimension of the Hilbert space of these auxiliary registers, for which no nontrivial technique is known; we lack a quantum analog of the Carathéodory theorem. In this paper, we develop a new non-Carathéodory-type tool for evaluating expressions involving a single quantum auxiliary register and several classical random variables. As we show, such expressions appear in problems of entanglement-assisted Gray-Wyner and entanglement-assisted channel simulation, where the question of whether entanglement helps in these settings is related to that of evaluating expressions with a single quantum auxiliary register. To evaluate such expressions, we argue that developing a quantum analog of the Carathéodory theorem requires a better understanding of a notion which we call “quantum conditioning.” We then proceed by proving a few results about quantum conditioning, one of which is that quantum conditioning is strictly richer than the usual classical conditioning." @default.
- W3101967395 created "2020-11-23" @default.
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- W3101967395 date "2014-01-01" @default.
- W3101967395 modified "2023-09-24" @default.
- W3101967395 title "On Dimension Bounds for Auxiliary Quantum Systems" @default.
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- W3101967395 doi "https://doi.org/10.1109/tit.2013.2286079" @default.
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