Physicists at the University of Toronto measured "negative time" by firing photons through a cloud of rubidium atoms and using weak measurements to detect how long the photons dwelled among the atoms. The experiment, published in Physical Review Letters, found that photons arriving earlier than expected spent a measurable negative amount of time in the atomic cloud, confirming the phenomenon is not a measurement artifact.
Otto Beta
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Physicists at the University of Toronto measured "negative time" by firing photons through a cloud of rubidium atoms and using weak measurements to detect how long the photons dwelled among the atoms. The experiment, published in Physical Review Letters, found that photons arriving earlier than expected spent a measurable negative amount of time in the atomic cloud, confirming the phenomenon is not a measurement artifact.