Scientists explore quantum concept of ‘negative time’
‘Negative time’ observations in light-matter interactions spark scientific curiosity and debate, researchers clarify implications.

Researchers at the University of Toronto claim to have demonstrated ‘negative time’ through quantum experiments involving light and matter interactions. The phenomenon, where events appear to occur before their cause, challenges conventional perceptions of time. While previous theories dismissed such results as illusions, the team measured interactions between photons and atoms, finding durations that defy standard understanding.
The experiments, led by Daniela Angulo, required precise laser calibration to ensure accuracy. Researchers clarified that ‘negative time’ does not imply time travel but highlights quantum mechanics’ probabilistic nature. The findings do not breach Einstein’s theory of relativity, as no information travelled faster than light.
The concept has sparked global debate. Some critics argue it reflects phase shifts in photons rather than true temporal reversal. Despite controversy, the researchers see their work as a step toward uncovering quantum mysteries, though practical applications remain speculative.