this post was submitted on 11 Dec 2025
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oh boy, here I go banging this drum again:
When physicists say “observe”, they actually mean “measure”. And to measure a photon of light, you have to interact with it somehow, there is no passive way to do so.
The post’s header image implies that the interference pattern goes away just by looking at it. If that were the case, we would never see the interference pattern, never know it was there in the first place! In the actual experiment, they put a sensor at one or both of the slits. But to “sense” a single photon, you have to interact with it in some way. Otherwise you wouldn’t know it was there.
Again, this is where the language trips us up. Rather than “sensor”, would really be more accurate to say they put a photon-touch-er at the slits.
So, what we actually get is “Touching the photon changes the photon’s behavior.” The universe doesn’t magically infer when we happen to be looking at it, there is no spooky action-at-a-distance!
But then what is the significance of this experiment? Why is it so popular if it's that simple and why is it usually associated with quantum physics?
If not touched the photon goes through both slits and interacts with itself, which is still super weird. Basically, it's a wave if not touched, but a particle if touched.
Well yes'nt I say a vertasium video and he explained it a bit differently. However I still didn't understand it. But they show the effect in different ways so it is easier to understand.
https://www.youtube.com/watch?v=qJZ1Ez28C-A
I have actually seen that video. But my simplification is still correct, except that I should've used the word "behaves". Because for the purposes of how it will behave the simplification shows the effects clearly.