Timelike Nonseparability and Retrocausation
  Renewed interest in the quantum zigzagging causality model is highlighted by an ingenious proposal by Suarez (quant-ph/9801061) to test the timelike aspect of nonseparability. Taking advantage of a work by Froehner I argue that the Dirac representation of a state, has the Bayesian-like connotation of best estimate given the Hilbert frame chosen. As a measurement perturbs uncontrollably a system it is (Hoekzema's wording) a retroparation. My bet is that Suarez' sources and sinks of paired particles operating inside the coherence length of the laser beam will evidence retrocausation. 
Olivier Costa de Beauregard (Fondation Louis de Broglie, Paris)