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- W2808059143 abstract "An essential part of the scientific method is the ability to test alternative hypotheses on the cause-effect relationships underlying a set of observed phenomena. Traditionally, tests of causal relationships have been based on classical statistics, which effectively describes the macroscropic world. However, classical statistics does not provide an adequate description of phenomena happening at the quantum scale, where a richer spectrum of causal relationships becomes accessible. Here we show that the quantum laws can be exploited to speed up the detection of causal relationships, allowing an experimenter to identify the causal structure of unknown processes from a small number of samples. We demonstrate this possibility in the task of identifying the effect of a given variable, where we show that a quantum strategy can find the correct answer exponentially faster than the best classical strategy. Our strategy attains the ultimate performance limit set by quantum mechanics, and beats all classical strategies by running multiple equivalent tests in a coherent quantum superposition. The same working principle leads to advantages in the task of detecting the presence of a causal link between two variables and in the task of identifying the cause of a given effect." @default.
- W2808059143 created "2018-06-21" @default.
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- W2808059143 date "2018-06-17" @default.
- W2808059143 modified "2023-09-27" @default.
- W2808059143 title "Quantum speedup in testing causal hypotheses" @default.
- W2808059143 hasPublicationYear "2018" @default.
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