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Publication - Professor Sandu Popescu

    Multiple Observers Can Share the Nonlocality of Half of an Entangled Pair by Using Optimal Weak Measurements

    Citation

    Silva, RF, Gisin, N, Guryanova, Y & Popescu, S, 2015, ‘Multiple Observers Can Share the Nonlocality of Half of an Entangled Pair by Using Optimal Weak Measurements’. Physical Review Letters, vol 114.

    Abstract

    We investigate the trade-off between information gain and disturbance for von Neumann measurements on spin-1/2 particles, and derive the measurement pointer state that saturates this trade-off, which turns out to be highly unusual. We apply this result to the question of whether the nonlocality of a single particle from an entangled pair can be shared among multiple observers that act sequentially and independently of each other, and show that an arbitrarily long sequence of such observers can all violate the Clauser-Horne-Shimony-Holt-Bell inequality.

    Full details in the University publications repository