3 research outputs found

    Finding a state in a haystack

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    We consider the problem to single out a particular state among 2n2^n orthogonal pure states. As it turns out, in general the optimal strategy is not to measure the particles separately, but to consider joint properties of the nn-particle system. The required number of propositions is nn. There exist 2n!2^n! equivalent operational procedures to do so. We enumerate some configurations for three particles, in particular the Greenberger-Horne-Zeilinger (GHZ)- and W-states, which are specific cases of a unitary transformation For the GHZ-case, an explicit physical meaning of the projection operators is discussed.Comment: 11 page

    Southern African large telescope spectroscopy of BL Lacs for the CTA project

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