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Posted on 08/05/2026 11:12:42 AM PDT by BenLurkin
Photons traveling through a cloud of atoms can emerge so early that they appear to have spent a negative amount of time inside. Researchers tested whether this was merely a misleading feature of the light pulse by making extremely weak measurements of the atoms. Surprisingly, the atoms confirmed the same negative dwell time. The finding does not break standard physics, but it reveals that one of quantum mechanics’ strangest effects is physically measurable.
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Our experiment used photons – quantum particles of light – and the against-the-odds journey they must undertake to pass straight through a cloud of rubidium atoms.
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Based on the average time when the photon enters the cloud, one can calculate the expected average time it would arrive at the far side of the cloud, assuming it travels at the speed of light (as photons usually do).
What one finds is that the photon actually arrives far earlier than that. In fact, it arrives so early it appears to have spent a negative amount of time inside the cloud – to exit, on average, before it enters.
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The solution is to make, instead, a very imprecise (but still very accurately calibrated) measurement. That is the price paid to keep the disturbance negligible. Specifically, we fired a weak laser beam – unrelated to the single photon pulse – through the cloud of atoms, and measured small changes in the phase of the beam’s light to probe whether the atoms were excited.
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Amazingly, the result of this weak measurement of dwell time, when the photon goes straight through the cloud, exactly equals the negative time suggested by the photons’ average arrival time. Prior to our work, no-one suspected that these two times, measured in entirely different ways, would be equal.
(Excerpt) Read more at sciencedaily.com ...
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Anybody that’s spent more than 5 minutes with a tree hugging lib understands the concept negative time.
Maybe that explains how I could spend all my money before I actually got paid.
Strange quantum experiment shows “negative time” is more than an illusion. I think I’ve been in negative time before, woke up in strange places. At least they’re studying science.
I plan to use this discovery the next time I’m audited.
IRS agent: You haven’t paid any federal income taxes in the last five years.
Me: Five years? You’re looking at negative time, dude.
I fully expect to walk out of that interview with an apology from that IRS agent. And owing nothing.
👍
The culmination of what happens at the subatomic level is what we observe with the naked eye and with macro instruments. Alas it does not seem possible that these atoms in the form of molecules or structures can make a time leap backward.
Maybe they’ll even give you money!
Schrödinger’s cat experiment isn’t just a parlor game.
Oh, yeah. The “listen to me tell you how much I hate Trump” dissertations can also make time freeze solid.
Thanks for posting, BenLurkin.
That is completely amazing.
What does Artificial Intelligence think about this anomaly?
Wibbly-wobbly timey wimey.
How many Gigawatts was the laser?
😂😂
How do they know it’s the same photon? Does it have a label?.............
Another five years and maybe we can get a redo on Barack Obama.
“Turn me on dead man.”
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