Scientists Observe 'Negative Time' In Quantum Experiments

Researchers at the University of Toronto have experimentally observed "negative time" in photon interactions with atoms, suggesting a measurable effect rather than an illusion. The researchers stress that these findings, posted on the preprint server arXiv, don't imply time travel. Phys.Org reports: The experiments, conducted in a cluttered basement laboratory bristling with wires and aluminum-wrapped devices, took over two years to optimize. The lasers used had to be carefully calibrated to avo