Scientists Measured Negative Time in Quantum Physics Experiment

The conception of eternal instrumentality has its roots successful the cyclical cognition of time, which seems to beryllium communal to each pre-Christian European religions. Credit: JanetR3. CC BY 2.0/flickr

Scientists person measured what appears to beryllium a “negative” magnitude of clip successful a quantum physics experiment, according to a survey published successful Physical Review Letters.

The findings bash not mean researchers person discovered time travel. Instead, scientists accidental the experimentation reveals different antithetic diagnostic of quantum mechanics, the subdivision of physics that studies substance and vigor astatine highly tiny scales.

Researchers compared the unusual effect to Odysseus’s travel successful The Odyssey. In the ancient Greek story, Odysseus spends years stranded connected the land of Calypso, yet someway returns location sooner than expected. Scientists accidental quantum particles tin behave successful likewise puzzling ways.

Photons passed done rubidium atoms

The experimentation utilized photons, the particles that marque up light. Researchers fired azygous photons done a unreality of rubidium atoms nether cautiously controlled conditions.

The photons were tuned to a precise vigor level that matched the atoms’ resonance frequency. This allowed the photons to temporarily transportation their vigor into the atomic unreality earlier emerging again.

Most photons entering the unreality scattered successful random directions and failed to walk through. But the fewer photons that successfully crossed the unreality produced an unexpected result.

Scientists person measured what appears to beryllium “negative time” successful a quantum physics experiment.
Researchers fired photons done a unreality of rubidium atoms and recovered the particles seemed to walk little than zero clip wrong it. pic.twitter.com/YnWfBeWyKq

— Tom Marvolo Riddle (@tom_riddle2025) May 6, 2026

Using the photons’ mean introduction time, researchers calculated erstwhile they should look if they travelled usually astatine the speed of light. Instead, the photons appeared overmuch earlier than expected. The measurements suggested the photons had spent a antagonistic magnitude of clip wrong the atomic cloud.

Earlier studies questioned the effect

Physicists archetypal observed the unusual timing effect successful experiments conducted successful 1993. Many researchers aboriginal argued that the effect was lone an illusion caused by the beforehand borderline of the photon’s agelong airy pulse passing done the unreality portion the remainder scattered away.

But physicist Aephraim Steinberg and his squad wanted to trial whether the effect could beryllium measured straight wrong the atomic unreality itself.

The situation was that observing quantum systems excessively precisely changes their behavior, a improvement linked to the Quantum Zeno Effect. To debar disturbing the photons, researchers utilized a method known arsenic anemic measurement.

Weak measurements confirmed a antagonistic time

Researchers passed a abstracted anemic laser beam done the rubidium unreality and monitored tiny changes successful the laser’s light. These changes revealed whether the atoms temporarily stored the photon’s energy.

Single measurements provided lone unsmooth information. But aft millions of repeated experiments, researchers calculated the photons’ dwell clip with precocious precision.

The results matched the earlier timing measurements. The anemic measurements besides showed a antagonistic dwell clip wrong the atomic cloud.

Researchers accidental the findings suggest the effect is not simply a measurement illusion. Instead, it appears to beryllium a existent and measurable spot of quantum systems.

Although the experimentation does not interruption the laws of physics, scientists accidental it highlights however otherwise clip tin behave successful the quantum satellite compared with mean quality experience.