Instantaneous measurements of nonlocal variables
Berry Groisman, Benni Reznik, Lev Vaidman · Journal of Modern Optics · 2003
Relativistic causality imposes rigid restrictions on nondemolition (repeatable) measurements of nonlocal variables. We show that there are no causal restrictions on demolition (nonrepeatable) measurements: all Hermitian operators of multipartite quantum system can be measured instantaneously, provided unlimited supply of entanglement resources.