I always enjoy reading about quantum optics, and the concept of entanglement is mind-blowing (I mean after all, no less than Albert Einstein went to his grave thinking we must be missing something in the theory.)<p>However, the quantum erasure experiments are really just a variation on other Bell Violation experiments (which also appear to violate causality at first glance.) At their heart the wave functions appear to say that particles are in multiple locations at the same time (so "touching" one particle must affect the state of the other particle instantly.) This information, though, isn't useful until all the results are brought back to one location (i.e., all the strangeness is buried in _some combination_ of the lists of results in the different locations, which can only be combined in a way that obeys causality.) Each list of results by itself looks random. So in this sense, "when" exactly you get your result won't tell you anything.<p>So no, you can't retake that picture you really wanted but flubbed on your last vacation.