Quantum Mystery Resolved: The Cheshire Cat Experiment | Science News

I wonder why psychologists use dogs, physicists use cats, and biologists use hamsters in their experiments.

I bailed as soon as you quoted the utterly fictional "collapse of the wavefunction".

This is SO FAR over my head.

What about the quantum miracle in which a particle can be in a superposition of two different states: ad Schrodinger's cat, which is both alive and dead simultaneously...

Reminds me of something I've been wondering a while, lol,🧭 ..about how to emerge from a wormhole the way we entered, we place a lazer wall down the centre to navigate one side to another between to emerge what called "out" from another end.

I'd still rather remain on earth, & if worm holling, I'd do it as downsized to pack more evolution beneath our belt to be who'd downsized each so reality & we ebb & flow more over all mankind's great collective lifetime between ourselves & ourselves we've better chance of being born who better instrument of truth to be born who whenever transverse inhospitable space find 'out' means to some kind of a destination on another end.
Maybe time travel whilst humans still roam isn't humane, & maybe to downsize is what meant to do.

I loved the polarization flipper....

I have only watched it once. I am wondering how many times will I need to understand it.....If ever...before reaching my seemingly personal events horizon....

Very confusing!

I swear I did my best but I didn't understand sh*t in the end ;_;
I'll try watching it again later.

Sorry if these are stupid questions since I am nowhere near understanding physics but I'll try anyway. It is hard to get reasonable answers that I can really understand. Maybe s.o. can tell me, if my conclusions are way off or if I am getting closer. I'd be very grateful.
I keep thinking that all that is strange about qm, is how we talk about it, so in perfect alignment: In these experiments something is measuring (reacting to) an amount of energy that did move within the properties of a wavefunction (here it's light) and as the measurement (partly) uses the energy by measuring it, that energy is being converted, so the wf collapses and part of the information (free energy) about the collapse becomes one or more particles?
Since two or more things react with each other, this reaction is marked by something that in this case has the energy and properties of what is called a photon, kind of a ripple that travels on a wave or waveless? and decays quickly? In this case, it also proofs that a measurement has taken place at the "beginning" of the experiment and therefore could be measured somewhere else aka as something with the properties of before and after in the sequence/order of the experimental setup. Which binds the narrative to the order of the setup which also dictates the narrative of the reaction chain. Since sth. needs to create this ripple or particle, a beam splitter is used to introduce direction (order of causality) as an information or property to be extracted in the "end". 'Introducing' being the aquivalent of excluding all other possibilities? If you sent a wave through the splitter, you would interfere with how the wave distributes which is the information you could extract at the "end", photon by photon, if the set up allowed for it. So if the expression 'sending one photon' is accurate, you might have created a circular arguement. To be valid, the experiment has to allow for uncertainty to show certainty. But then you can't be certain. If you allow controlled uncertainty, you just get yourself in a more complicated selfcontradicting conundrum (Which is why Schrödinger spoke in cats, I guess, it is the only creature, able to survive final certainty 😸). Whatever you do, you have to exclude the data you want and don't want by not measuring it one way/path or the other. When sth. is possible, it is possible, only if it isn't, it isn't. Ergo, whatever you will have measured at the "end" of the experiment, all you know for certain, is that you did not exclude the possibility to measure it?

This cat is the most misleading concept in physics. To use the concept of something alive and dead as if it can be both is an abomination to both God and science..!
It actually misleads everybody from the perception of the dual reality of being in more than one state or position.

Did I do that?????

The logical explanation is that the mathematics of Quantum Mechanics represents the physics of Time ∆E ∆t ≥ h/2π. With the Classical Physics of Newton, representing processes over a ‘period of time’ as in his differential equations.

There are no photons. It's just upper or lower part of light wave. Then everything simply makes sense.

I'm still thinking about Born's Rule, Gaussian Distribution and Fourier Transforms in terms of frequency and amplitude. Quantum probability isn't classical probability, [ see Kolmogorov. ] Gerard 't Hooft sees it this way:
"as long as we use orthonormal transformations to go from one basis to another, Born’s rule, including the use of absolute squares to represent probabilities, is the only correct expression for these probabilities."
Others relate Newtonian and Scr odinger dynamics within the same Hilbert space framework but on a sub-manifold, going beyond the Ehrenfest theorem, and showing why the normal probability distribution must be the Born Rule. The velocity of the state at any point of the classical space sub-manifold can be decomposed into the classical (velocity, acceleration) and non-classical (phase velocity, spreading) components.
Thus the classical and quantum can be reconciled.

I'm confused

How much does all this woke b*llshit interfere with real science? I look at the opening of that paper talking about Alice in Wonderland and I immediately see a blue haired landwhale with a multitude of special pronouns and who needs all sorts of special validation as its writer.
I see videos of young adults who should be grown up enough to know better who are in college and studying to be lawyers and they were standing on tables screaming their freaking pronouns at a speaker who came to talk common sense to them. What is the courtroom of the future supposed to look like? (And the fact that the real women on that sports team with that man in a dress Lea Thomson when they complained about having to shower and dress in the same locker room they were told to deal with it or submit to brainwashing with some rainbow mafia bullshit. Don't like it? Tough. That is what happened. The 'powers that be' cared more about the delusional man in a dress than the actual real women!)
Anyway, I've also seen some strange people talking a bunch of woke nonsense in psychology.
How is all this inability to see reality, to accept real science and real facts and real biology going to affect (effect?) science? How will woke effect physicis and biology and other sciences? Hopefully there will not be many in these feilds.

Sabin’s quantum physics is about the probability of how much and not the certainty or science would be dead. It’s amazing you do not understand that. You try to say anything is certain makes you look foolish.

Quantum Christiansen

Our guinea pig is actually deceased daughter Makela 💀 😭 😂 🤣 😢

- Jainism 101

Chuba Shwetambara Jainism Sojourner Reavis Ho Kristos ICED EARTH : Setian Massacre 10,000 Strongsville 🇸🇾 🇨🇦 🥓

how much does a tiny free floating beam splitting mirror of say a billion atoms, recoil or not recoil Schrodinger style, after an extended period, where the wavefunction un-collapsed races off to infinity? Is it in some sort of superposition of reflected and un-reflected states? A 1 meter recoil displacement after a ~thousand years/~a micron a day?

Instruction unclear, I don't have a cat. Or a cake. Ohhh....

I have just done the SH quantum mechanics course on Brilliant so I have some understanding of this

This is deep. I studied physics a long time ago, but have to rewatch and use the pause button..

As the man said . Nothing to see here.

This makes no sense at all. It is back to if you dont look at the cat it is not there. Which has always been nonsense!

That was brilliant! How you got through it without misspeaking was amazing! Kind of like watching a replay of "Who's on First" Bravo!

This weak measuremnet is new to me. As we see that the wave function is more of a prediction device and that the elementary particles of the past are now composed of other particles, it makes me wonder about the idea of particles.

The idea of an elementary particle is so abstract like numbers, where you can simply split them forever into smaller numbers/parts. A particle is then just a wave that is constricted, just like light going through a slit. Waves on the hand, they make much more sense as it is that with 'relativeity', everything is defined by it's relationship to everything else. You can't measure anything without using something else to compare it; simultaneously both of those things might be indefinate and infinite but have differences that make them seem like discrete objects, but nothing we know of could exist independent of everything else as a truly discrete object otherwise there would be no way to interact with it or sense it.

So, everything has to be a wave and particles are just a concept and a way to model waves that are more or less discreet relative to other waves.

You lost me after 'hello'

very bad explained seems like she doesnt hold herfeet

I dont remember exactly in the Jeepers Creepers when they pulled over in that school bus if it was a flat tire from a knife or item thrown

Tja, ohne Katzen hätten wir keine Quantenphysik, damit keine Photovoltaik, keine Supraleiter, keine moderne Physik und keine erneuerbare Energie. - Da sollten doch ein Promill der Investitionen in diese Forschung und praktische Anwendungen an Tierheime oder Tierschutz gehen.

LOL you dont measure enough to get a definite result, just the tip.

So is light actually lights?

This description assumes the photon travels a single specific route. However, in the quantum perspective, there isn't a physical photon journeying through space. There's only the wave function (WF), describing all possible routes it could take until it collapses at the detector. Quantum mechanics doesn't involve tangible particles but rather wave functions. Photons only briefly exist WHEN the WF collapses. If we accept this simple interpretation, QM no longer is spooky, weird or difficult to explain.

This all rests on the assumption that there is a complete separation of the + and - aspects of photons in the first place. How often we find that all our generalizations, while so often usefully "right" are wrong when we get to splitting hairs. Nature in unfathomably complex.

Can you explain why it is that the photon and the polarization are on the top or bottom instead of the photon being spread out over the whole experiment and the difference being where it interacts with the equipment?

well, the solution of this "mystery" is pretty obvious and trivial. I don't even understand what physicists didn't understand.

When + polarization photons take the upper path and - polarization photons take the lower path, both detectors 1 & 2 light up. But initially both paths had both polarizations and only detector 1 lit up due to constructive and destructive wave summing. Why does polarization sorting light up detector 2?

Wait, is the spin of a photon just the phase shift between perpendicular components of it's wave function? Or am I completely derailed here?

Is not placing a polarisation filter in one of the paths effectively changing that path's length? A light beam going through a denser medium changes velocity?

Am I the only one who's following along perfectly well with the normal explanation, but instantly get lost whenever the 'analogy' of the cat comes in?

please one more time and more clearly, use a better animation..well thank you

Classic example of how quantum physicists are getting themselves twisted in knots, because there is something fundamentally wrong with quantum physics. Someone, somewhere, published a paper in the 1920s or 1930s that got something completely wrong and no one sussed it out and everything in quamtum physics has been wrong from that point. I dont care how much you emphasize that the teeny tiny world is different and we can't use our real world experience or classical physics there - trust me there is something fundamentally wrong with quantum physics and once it dawns on scientists, we will get the unified theory they seek.
Quantum entanglement? Bah humbug.

Why is it a problem to denote these states as horizontal and vertical? I don't get why it's necessaryto dumb it down to +/-

Are you sayin Plus & Plus does not equal Minus? Mathematicians are surely jumping out of windows over this.

sorry, but that's again the same issue of trying to apply quantum stuff to single particles and then being surprised quantitative / statistical properties don't apply to discrete particles.

The whole thing is probably like Special Relativity, where supposedly competent scientists have written ridiculously convoluted articles based on it, never realizing the obvious fact that the laws of gravity prove the theory can't be true in the first place. If objects falling from the same height reach the bottom of the fall together then how could one of them be in a time dilated frame which is moving horizontally to gravity? It would mean that in the frame with the slower time rate the object would be seen to fall with faster velocity than in the frame without time slowed, since velocity is distance, which is the same for both objects, divided by time, which is different for both objects. That's a pretty obvious thing to think of, yet apparently nobody did, all this time. It's probably the same with quantum, can light be a wave until it's measured and then be a particle? That would mean that measuring only half of the wave would make it collapse into half of a particle.