Physicists Confirm Light’s Negative Time After 1 Million Atom-Cloud Tests

3 articles · Updated · Livescience.com · May 20

A Physical Review Letters study confirmed that transmitted photons in an atom cloud show a negative interaction time, with atomic measurements indicating light can appear to leave before fully entering.
Using atoms’ excited states as the readout, the team avoided a key flaw in earlier detector-based experiments that could have made early-arriving photons look artificially fast.
weak measurements made each run too noisy to interpret alone, so researchers averaged about 1 million trials across roughly seven parameter sets over about 70 hours.
The result does not imply time travel; the researchers say it fits standard quantum physics and next plan to test whether scattered photons carry compensating positive time so the beam’s overall average stays at zero or higher.

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