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Negative Time

All articles tagged with #negative time

science1 month ago•5 min saved

Quantum Oddity: Photons Appear to Exit an Atomic Cloud Before Entering

Physicists used weak measurements to probe how long photons spend in a rubidium atomic cloud as they travel straight through. They found a negative dwell time for those that pass, meaning the photons seem to arrive at the far side before they would have if they had spent time in the cloud, a result that matches the negative time inferred from arrival statistics. The effect is not an artifact of the measurement but a real, measurable quantum phenomenon explained by standard physics, highlighting that negative time in quantum interactions is possible and observable.

via SciTechDaily|

#negative-time #photons #quantum

science1 month ago•58 min saved

Quantum test confirms photons can exhibit negative time

Physicists report that photons passing through a cloud of atoms can appear to exit before entering, i.e., negative transit time. In a Physical Review Letters study, the researchers monitored the atoms’ excited state during the photon’s passage with a second readout beam and used weak measurements, requiring about 1 million trials across seven parameter sets to obtain a clear signal. The result, which aligns with standard quantum mechanics, shows transmitted photons can have negative time while scattered photons carry positive time, keeping the beam’s average time nonnegative. The next step is to test time effects for photons that don’t pass through the cloud.

via Live Science|

#atomic-physics #negative-time #photons

science10 months ago•4 min saved

Quantum Physics Experiments Reveal 'Negative Time' Phenomenon

Scientists at the University of Toronto observed negative interaction times in quantum physics experiments, where light passing through atoms appears to exit before it should, due to wave reshaping rather than actual backward travel in time. This phenomenon, confirmed through precise measurements with rubidium atoms, advances understanding of quantum effects and could influence future quantum technologies, though practical applications remain uncertain.

via Earth.com|

#atom-interaction #light-pulses #negative-time