Physics – Quantum Physics
Scientific paper
2011-12-15
Physics
Quantum Physics
7 pages, 3 figures
Scientific paper
Bell inequalities limit measurable correlations between properties of two physical systems, under two assumptions: that these properties can be ascribed independent of measurement, and that influences between them are bounded by light-speed propagation. Certain quantum entangled systems do not submit to this local realistic description, illustrated by copious experimental tests. Usually, to avoid quantum mechanical measurement back-action, different measurements are made on each of several subensembles of identical quantum systems. Here we show that weak measurements, which avoid back-action by weakly coupling the measurement device to the system, can be used to identically measure all quantum systems in the ensemble, providing a direct empirical footing from which to reason about their properties. The quantum mechanical violation of Bell inequalities is explained by the negative weak-valued probabilities that we measure, compatible with an operational physical model which preserves locality at the expense of objective realism.
Higgins B. L.
Palsson Matthew S.
Pryde Geoffrey J.
Wiseman Howard M.
Xiang Guo-Yong
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