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 avoid distorting the results. [...] The explanation lies in quantum mechanics, where particles like photons behave in fuzzy, probabilistic ways rather than following strict rules.

Instead of adhering to a fixed timeline for absorption and re-emission, these interactions occur across a spectrum of possible durations -- some of which defy everyday intuition. Critically, the researchers say, this doesn't violate Einstein's theory of special relativity, which dictates that nothing can travel faster than light. These photons carried no information, sidestepping any cosmic speed limits. "We've made our choice about what we think is a fruitful way to describe the results," said Aephraim Steinberg, a University of Toronto professor specializing in experimental quantum physics, adding that while practical applications remain elusive, the findings open new avenues for exploring quantum phenomena.

"I'll be honest, I don't currently have a path from what we've been looking at toward applications," he admitted. "We're going to keep thinking about it, but I don't want to get people's hopes up."