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- W4225527999 abstract "Two spatially separated observers, Alice and Bob, share a bipartite two-qubit entangled state and perform measurements to witness entanglement. After their measurements, they pass their qubits to a subsequent pair of observers who try to perform the same task independently, and so on. Here we ask: what is the maximum number of such pairs that can perform this task successfully? It has previously been conjectured that not more than one pair of observers can detect Clauser-Horne-Shimony-Holt ``Bell-nonlocal'' correlations in this setup. We prove that, on the contrary, entanglement can be witnessed by arbitrarily many pairs of observers. The dissimilar nature between entanglement and Bell-nonlocal correlations is therefore uncovered in a rather radical way, when considering sequentially acting pairs of observers. We prove this statement to be true when the initial shared state is any pure entangled state, a class of Bell-nonlocal mixed states, or a class of Bell-local entangled states." @default.
- W4225527999 created "2022-05-05" @default.
- W4225527999 creator A5057835375 @default.
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- W4225527999 date "2022-09-15" @default.
- W4225527999 modified "2023-09-26" @default.
- W4225527999 title "Recycled entanglement detection by arbitrarily many sequential and independent pairs of observers" @default.
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- W4225527999 doi "https://doi.org/10.1103/physreva.106.032419" @default.
- W4225527999 hasPublicationYear "2022" @default.
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