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[-] captainjaneway@lemmy.world 103 points 3 months ago* (last edited 3 months ago)

The word "observed" has largely been conflated with human perception in the layperson's understanding of quantum mechanics. When they were first experimenting with the dual slit experiment, they were simply trying to make measurements to predict where an electron might end up after entering one of the two slits. However they soon discovered that their measurements changed the behavior of the electron. That behavior has been denoted as an observation however observation is very vague.

It's better to say "a measurement which causes a wave-function collapse" rather than an observation. When phrased that way, it feels a lot more explicit and it allows lay people like myself to ask the next question "what causes a wave function to collapse?"

Source: I just asked my physics PhD wife about this a couple nights ago and she did her best to explain it to me.

If anyone can explain what exactly causes the wave function to collapse, id appreciate it. Because I can't understand anything I read online.

Also this meme checks out. A person could observe their CPU with the right conditions and instruments to cause a wave function collapse. But I believe a Qbit can reset its state no?

[-] Korne127@lemmy.world 15 points 3 months ago

I'm sorry but what you describe pretty much sounds like… observed

[-] MoonJellyfish 45 points 3 months ago

To observe it you have to interact with it in some way. This mean in order to "see" it you need to shoot some photons at it or send some radio signals which will reflect. It all has an influence.

So the problem is not "observing" in in some philosophical sense. The problem is that you need to interact with it in order to "observe" it.

It's the interaction that makes "wave function to collapse" not the fact that you observed it.

[-] captainjaneway@lemmy.world 16 points 3 months ago

If you use your eyes, nothing happens. Most people think "observe" means they can just look at the experiment and expect it to change. That's why so many people end up in metaphysics thinking their own perception has any impact on the outcomes of physical states. In reality, it makes no difference.

[-] piecat@lemmy.world 14 points 3 months ago* (last edited 3 months ago)

Say you were a spy, and you think there's a laser guarding the largest diamond in the world.

There's no way to detect if the laser is there without putting some form of matter in the way of the laser. Be it a hand, or spray bottle.

Now at the museum, a mist won't set off the alarm, but you're still reflecting some of the photons out of the beam and into your eyes. Otherwise you wouldn't see the beam...

But for a quantum experiment, where we care about each individual photon, spraying a fine mist will affect the experiment. Sticking anything in that laser beam path will affect the measurement.

So how do you make a measurement without interacting? As far as we know, you can't.

[-] Churbleyimyam@lemm.ee 3 points 3 months ago

That makes perfect sense

[-] AngryCommieKender@lemmy.world 14 points 3 months ago

"The wave function collapse is just this thing that happens, you know."

-Gag Halfrunt

[-] Chrobin@discuss.tchncs.de 5 points 3 months ago

Many people are trying to give a definitive answer, and there are good theories, but honestly, it is still very much an open question. There are multiple interpretations and as people tend to do in popular science, some spread their opinion as a fact, but we don't have one correct answer.

[-] pipows 5 points 3 months ago

I was not expecting a comment on a shitpost community to make quantum physics more clear to me

[-] andros_rex@lemmy.world 3 points 3 months ago* (last edited 3 months ago)

The Schrödinger equation is a multi variable second order partial differential equation. You end up with a “position operator” and a “momentum operator” (momentum is mass times velocity, so we focus on the velocity bit). Because of the way that taking a partial derivative works, you end up applying one you can’t get the other.

Idk that’s probably a terrible explanation (I got a C in that class lol), but it is really cool when you see how the math works.

[-] DogWater@lemmy.world 3 points 3 months ago

For a mathless explanation, I believe it's because in the quantum world all the atoms that interact are part of the same system. That includes the ones that make up the instruments and the scientists themselves. If you put the photons in an experimental apparatus the results can change because the system is different. Meaning you can influence the waveform collapse simply by experimenting to try and understand it.

I hope that's right I watch a ton of physics YouTube, so I hope I'm absorbing some of this stuff.

For more crazy shit, see how photons traveling across the universe cause the electron they originate from at the start and the electron they terminate at the end to agree to exchange that energy across space and time. It's mind bending. From the photon perspective (at the speed of light) a journey across the cosmos is instantaneous. No time passes for the photon from its frame of reference.

On YouTube; PBS Spacetime, History of the universe, Alpha Phoenix, veritasium, cool worlds, astrum, vsauce

[-] Corkyskog@sh.itjust.works 1 points 3 months ago

Wait, what's the math? At this point that may be way more useful to understand.

[-] Chrobin@discuss.tchncs.de 1 points 3 months ago

For that, you need Hilbert spaces, linear operators on them, a little spectral theory, ...

[-] Lojcs@lemm.ee 1 points 3 months ago* (last edited 3 months ago)

Perhaps the wave function always collapses no matter what, but the way it collapses changes? If there was no screen for the photons to interact with they'd continue to act like waves but since there's a screen they collapse at some point on it dictated by the wave. And if you try to observe how they end up there you end up collapsing it earlier so where they go are dictated by the earlier state of the wave.

[-] gmtom@lemmy.world -4 points 3 months ago
[-] ObviouslyNotBanana@lemmy.world 46 points 3 months ago
[-] PainInTheAES@lemmy.world 33 points 3 months ago
[-] asbestos@lemmy.world 15 points 3 months ago
[-] DogWater@lemmy.world 2 points 3 months ago
[-] PainInTheAES@lemmy.world 3 points 3 months ago

I've certainly died of cringe. DNR

[-] DogWater@lemmy.world 3 points 3 months ago

It's wild isn't it??? Someone doing NPC dances on twitch about a viewers deceased grandma??? What a world we live in.

[-] PipedLinkBot@feddit.rocks 1 points 3 months ago

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[-] casmael@lemm.ee 34 points 3 months ago

Quality greentext tbh

[-] gmtom@lemmy.world 32 points 3 months ago

um akshually quantum computers have a QPU not a CPU

[-] Donkter@lemmy.world 15 points 3 months ago

Would it not still be a Central Processing Unit?

[-] gmtom@lemmy.world 12 points 3 months ago

Depending on the design they might still have a CPU, but it wouldn't be where the quantum wizardry happens.

[-] pipows 8 points 3 months ago

No, quantum computing (at least for now) sucks at the tasks CPUs are great at, so the idea of to have quantum as a support to the CPU, handling complex, heavily paralyzed commoutations, like the GPU does nowdays

[-] Slatlun@lemmy.ml 29 points 3 months ago

The computer is constantly both bricked and not bricked. No way to know until you push the power button

[-] Mr_Smiley@lemmy.world 14 points 3 months ago

Heisenberged

[-] GregorTacTac@lemm.ee 11 points 3 months ago

That's.... not how quantum mechanics work.

[-] CluckN@lemmy.world 15 points 3 months ago

That’s… how quantum mechanics works.

[-] ObviouslyNotBanana@lemmy.world 22 points 3 months ago

That... Might be how quantum mechanics works sometimes.

[-] HornyOnMain@fedia.io 9 points 3 months ago

The duality of ~~man~~ Heisenberg strikes again

[-] GregorTacTac@lemm.ee 1 points 3 months ago

Until the state of the matter is transmitted in any way or form the matter is in a superposition. This includes getting hit by an electron or a photon.

[-] CaptPretentious@lemmy.world 1 points 3 months ago

But it's how a joke works...

[-] xx3rawr@sh.itjust.works 3 points 3 months ago

What? You shoot high energy photons off your eyes/ears/nose?

this post was submitted on 22 Mar 2024
1053 points (98.7% liked)

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