On a proposal of superluminal communication
  Recently, various new proposals of superluminal transmission of information have appeared in the literature. Since they make systematic resort to recent formal and practical improvements in quantum mechanics, the old theorems proving the impossibility of such a performance must be adapted to the new scenario. In this paper we consider some of the most challenging proposals of this kind and we show why they cannot work. 
GianCarlo Ghirardi and Raffaele Romano
quant-ph