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- W2074097809 abstract "Discordant states appear in a large number of quantum phenomena and seem to be a good indicator of divergence from classicality. While there is evidence that they are essential for a quantum algorithm to have an advantage over a classical one, their precise role is unclear. We examine the role of discord in quantum algorithms using the paradigmatic framework of restricted distributed quantum gates and show that manipulating discordant states using local operations has an associated cost in terms of entanglement and communication resources. Changing discord reduces the total correlations and reversible operations on discordant states usually require nonlocal resources. Discord alone is, however, not enough to determine the need for entanglement. A more general type of similar quantities, which we call $K$ discord, is introduced as a further constraint on the kinds of operations that can be performed without entanglement resources." @default.
- W2074097809 created "2016-06-24" @default.
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- W2074097809 date "2013-08-08" @default.
- W2074097809 modified "2023-10-17" @default.
- W2074097809 title "Discord and quantum computational resources" @default.
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- W2074097809 doi "https://doi.org/10.1103/physreva.88.022307" @default.
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