Going for a blast into the real past

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’s science talk for saying 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.”
Going for a blast into the real past