Single Photon Interference

Submitted by: ElectricEye 4 years ago in Science

What happens when single photons of light pass through a double slit & are detected by a photomultiplier tube? Science!
There are 12 comments:
Male 15,832
@handimanner

Firesign Theater? Really? Wow! You really ARE as old as you claim to be.
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Male 2,097
How can you be in two places at once if you are really nowhere at all?

Firesign Theater
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Male 37,794
[quote]electrons will do the same thing.[/quote]
lolz @OldOllie: Electrons do a lot more "weird things" too! Naughty little blighters!

I read your post on the AGW thread (Mar.10 iirc) Very well done!

[quote]How can we be sure it`s a single photon every time? And not 2 or 3 that then interfere?[/quote]
@paperduck: iirc, there`s a gizmo that only fires 1 photon at a time. They rig it that way and it`s (apparently) easy to check if it`s working properly.
The "double slit" experiments are what makes science fun!
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Male 480
I prefer this video on the same subject http://www.youtube.com/watch?v=tu57B1v0SzI
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Male 15,832
[quote]How can we be sure it`s a single photon every time? And not 2 or 3 that then interfere?[/quote]
The photomultiplier is detecting single photons. Perhaps the best way to visualize it is that the photon travels as a wave, but it interacts as a particle. That`s not exactly what`s going on, but it`s the best way I know to explain it.

If you think that`s weird, electrons will do the same thing.
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Male 23
More posts like this
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Male 1,745
How can we be sure it`s a single photon every time? And not 2 or 3 that then interfere?
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Female 6,381
Gee, a cute scientist!
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Male 936
this was a pointless video, this has been known for decades. What I`m surprised about is that he did not mention the fact that if we observe the photon the pattern will not be created and the photon will in fact travel through only one slit. Observation turns the photon into a particle. What`s even more interesting is that if we don`t observe the photon until AFTER it passes the slit it will not create the pattern as expected. The photon of light, along with the universe, actually "knows" if we are going to observe it or not before we observe it (or it travels back in time). Either way, it`s very interesting and only further proves we don`t know much about how the universe really works
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Male 37,794
I like science!
Time theory. Light. Heisenberg`s Uncertianty. Atomic structure? Love it!

And what uses all these things? The Clock In The Box!

Quantum Entanglement as it is called these days.
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Male 38,483

Side note, the speed of light {299,792,458 meters per second} is not a universal constant. Scientists have slowed photons down to only 38
miles per hour.

Google it. Cool stuff.

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Male 2,729
Link: Single Photon Interference [Rate Link] - What happens when single photons of light pass through a double slit & are detected by a photomultiplier tube? Science!
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