How quantum correlations enhance prediction of complementary measurements

Details How quantum correlations enhance prediction of complementary measurements How quantum correlations enhance prediction of complementary measurements

2004-06-15

arxiv.org/abs/quant-ph/0406110v1

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.93.180404

If there are correlations between two qubits then the results of the measurement on one of them can help to predict measurement results on the other one. It is an interesting question what can be predicted about the results of two complementary projective measurements on the first qubit. To quantify these predictions the complementary \emph{knowledge excesses} are used. A non-trivial constraint restricting them is derived. For any mixed state and for arbitrary measurements the knowledge excesses are bounded by a factor depending only on the maximal violation of Bell's inequalities. This result is experimentally verified on two-photon Werner states prepared by means of spontaneous parametric down-conversion.

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