Submitted by Marvy: If his experiment with splitting photons actually works, says University of Washington physicist John Cramer, the next step will be to test for quantum retrocausality. That is he hopes to find evidence of a photon going backward in time. "It doesn't seem like it should work, but on the other hand, I can't see what would prevent it from working," Cramer said. "If it does work, you could receive the signal 50 microseconds before you send it."Uh, huh ... what? Wait a minute. What is that supposed to mean? Roughly put, Cramer is talking about the subatomic equivalent of arriving at the train station before you've left home, of winning the lottery before you've bought the ticket, of graduating from high school before you've been born -- or something like that. "It probably won't work," he said again carefully, peering through his large glasses as if to determine his audience's mental capacity for digesting the information. Cramer, an accomplished experimental physicist who also writes science fiction, knows this sounds more like a made-for-TV script on the Sci Fi Channel than serious scientific research. "But even if it doesn't work, we should be able to learn something new about quantum mechanics by trying it," he said. What he and UW colleague Warren Nagourney plan to try soon is an experiment aimed at resolving some niggling contradictions in one of the most fundamental branches of physics known as quantum mechanics, or quantum theory.
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