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- W3204371386 abstract "In a quantum measurement process, classical information about the measured system spreads throughout the environment. Meanwhile, quantum information about the system becomes inaccessible to local observers. Here we prove a result about quantum channels indicating that an aspect of this phenomenon is completely general. We show that for any evolution of the system and environment, for everywhere in the environment excluding an $O(1)$-sized region we call the quantum Markov blanket, any locally accessible information about the system must be approximately classical, i.e. obtainable from some fixed measurement. The result strengthens the earlier result of arXiv:1310.8640 in which the excluded region was allowed to grow with total environment size. It may also be seen as a new consequence of the principles of no-cloning or monogamy of entanglement. Our proof offers a constructive optimization procedure for determining the quantum Markov blanket region, as well as the effective measurement induced by the evolution. Alternatively, under channel-state duality, our result characterizes the marginals of multipartite states." @default.
- W3204371386 created "2021-10-11" @default.
- W3204371386 creator A5078525805 @default.
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- W3204371386 date "2021-09-28" @default.
- W3204371386 modified "2023-10-14" @default.
- W3204371386 title "Emergent classicality in general multipartite states and channels" @default.
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- W3204371386 doi "https://doi.org/10.22331/q-2021-09-28-555" @default.
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