Multiple Observers Can Share the Nonlocality of Half of an Entangled   Pair by Using Optimal Weak Measurements
  We investigate the trade-off between information gain and disturbance for a class of weak von Neumann measurements on spin-$\frac{1}{2}$ particles, and derive the unusual measurement pointer state that saturates this trade-off. We then consider the fundamental question of sharing the non-locality of a single particle of an entangled pair among multiple observers, and demonstrate that by exploiting the information gain disturbance trade-off, one can obtain an arbitrarily long sequence of consecutive and independent violations of the CHSH-Bell inequality. 
Ralph Silva, Nicolas Gisin, Yelena Guryanova, and Sandu Popescu
quant-ph