What can Schrödinger's cat teach us about quantum mechanics? - Josh Samani 

*No cats were killed during this video* however, *Cats were killed during this video*

Schrödinger's cat walks into a bar. And doesn't.

Schrodinger: So do you want to live or die? Cat: *Yesn't*

How to make a theory complicated : *Add "Quantum" in it*

This is what "Curiosity killed the cat" really means - "[The] Curiosity [of a physicist by the name of Schrödinger] killed the [physicist's] cat."

The animation is absolutely adorable. Well done Dan Pinto!

Jonas is dead and yet Jonas is alive too. That's the Schrodinger's Jonas

Narrator: "the everyday world u know and love.." Me: bold of u to assume-

As a cat I find this video offensive.

Cat experiment was a thought experiment. No cats were harmed. They should mention it in the video.

A physicist who doesn't particularly like cats, puts a cat in a box..... Along with a bomb. *They had us in the first half, not gonna lie*

RU-vid recommended to me because of DARK series!!!

cat exists schrodinger: im about to end this cats whole career, or am I?

I've been trying for years to wrap my head around quantum physics (like many people) and this video did a really good job of explaining it. So as I understand it now, quantum physics is something that occurs at an atomic level but at a macro level that we would observe in everyday life...

*At ending* "Maybe your cat will teleport to another safer Galaxy, with no boxes." Me: But cats love boxes..

Before watching this video I was confused, and now I'm still confused

**Schrödinger has entered the chat** -**Einstein has exited the chat**

They sud have explained why Quantum physics rules out both cat dead (or alive) scenario

Removing the “both dead” and “both alive” possibilities seemed kind of arbitrary. That must be the part that is too difficult for us mere mortals to understand.

After 5 years this video got too much attention because of Netflix's DARK.

I think Einstein disliked this video 117 times.

I am so surprised I don't see a single comment specifically about how cute the cats are. THEY ARE JUST TOO DAMN CUUUUTE!!!

Shake the box, u will know either the cat is alive or dead without opening😂😂😂

I mean I understood the story of cats well until he said “ quantum “

Quantum physics always make my brain hurt. x_x

"The everyday world you ... love..." Making a lot of assumptions there chief... Who can love a world with a universal speed limit?

Me : Is your cat alive or dead ? Schrodinger : Um , it is actually ... Meanwhile cat from box : Meow !

Now, this raised even more questions in my mind.

I wish there is a video like this about spin of particles. It will be fascinating to understand the spin with a cat explaining.

This is the best rendition (examples ; explanation) of super-position and entanglement I have ever heard Very well explained ...So well... That your almost giving away the whole secret And I do mean this seriously !!!

I wish I had been taught quantum chemistry like that.

And after studying it deeply The Germans created the 'Dark' series and messed up our minds. Such a powerful stuff.

.. so how do things become entangled? also, how do scientists find two entangled particles? is there a way to force entanglement upon two particles?

Schrodinger:I don't know if cat is dead or alive Cat:meow! Schrodinger:shut up!

Who came here after watching "Dark" Season 3?

Appreciate the cool animation they did for the video.... Great concepts made understanding with simple and funny graphics....

Me: Do you guys just put *Quantum* in front of everything? Ohhh just remembered, Sheldon Cooper already explained this Cat thing to me

If it's true, we do live in a simulation, where everything is already predicted.

The example at the start does not make sense to me because any time i throw a ball it will either land on my head, foot or i just will lose it

I didn't realize before this how absolutely beautiful and mind-blowing science is.

Yes. I'm here from Ant-Man and The Wasp.

1:29 Yes, you would know, because the box would be destroyed by a bomb.

There's a lot of entanglement going on these days...

That little cat wink at the end near about killed me

I just looked at the cat the whole time :/

If you could resurrect one cat would the other one die instantly ?

Wow...never knew this channel existed..subbed as fast as possible!!!!

I can't belive a 2 year struggle could be solved with a 5 minute video. Like where was that 2 years ago! 🤣

Wow! I suddenly start to love physics after watching the Dark series!

The method of explaining the topics is really very good. Some more videos regarding quantum physics will be really appreciated

Mind blowing theory and crystal explanation.

Oh dear. I'm having my Sunday night, RU-vid video binge, existential crisis again

its strange how youtube recommended me this video while i was watching The Big Bang Theory, where they were pulling a joke on Schrodinger’s cat

4:21 i think there's a way of information transfer it's just that we haven't discovered that yet

*RU-vid knew what’s in my textbooks better than myself* 😨😂

The animation of this video is better than any of your other videos.

So,quantum entanglement is basically a long distance relationship!

What a fantastic video, well narrated with just enough information and extremely well animated. Thank you.

The pause before the cat wink in the ending though

The two both alive and both dead entanglement meant that for any subatomic particle , it's impossible to find it at two quantum states .

"Quantum entanglement" Will Smith: Where do I begin?

I didn't understand how he eliminated 2 probabilities (2 dead or 2 alive). Can someone explain?

How can you not know if the bomb exploded without opening the box?! I mean it's a freakin' bomb josh.

You'll know the cat is alive when it starts to meow. 🤣

How the fuck would you not know if a bomb went off inside the box until you open the lid? There wouldn't even be a box left for you to look at.

this is one of the highest quality vids from TEDed yet.

Wow! Even my best teacher couldn't explain to me so clearly))) thanks)

Schrödinger's cat: "And I took that personally "

I love they made all 'humans' cats in this vid 😂

I was about to post a joke on quantum mechanics but it is funny and unfunny at the same time.

Thank you for telling me a topic that i have to contain till i reach college where i can finally tell this

It is an old saying” if you can not explain it to a child then you do not know it “ , that is what this video is like a very simple explanation that everybody understands. Thanks

I know you are here because RU-vid recommended you after watching Dark S3

Quantum entanglement allows for multiple universes. One for each outcome of each decision/path taken. One universe where you were never born. One where you died at birth. One where your mother died at birth and you continued on. One were you were raised Catholic. One were you were raised as a Pagan. One were you died in a car crash, the other not. I like the idea that I'm like Jared Leto in the movie "Mr. Nobody"; where I live all possibilities, but the one I choose to live out is the one where I make it to the end. In other people's reality, I may be a different person.

Two points to make. First the bomb is detonated by a microscopic or quantum mechanical event such as an alpha particle hitting some nitrogen tri-iodide. Second entanglement is most apparent with spin measurements with the detectors oriented at oblique angles like 45 degrees. That's when information of some sort has to travel at superluminal speed.

They don't need to communicate to one another because they were always spinning in opposite directions from the moment they became "entangled". We just didn'y know in which direction, but as soon as we measure, we now the direction the spin of both. In a way, both particles have the information of itself and the one entabgled to it, that's wh we dont need the to communicate. The thing is, we can't know the spins of the particles until we measure them, and when we measure them, we know the spins of both so they're no longer entangled. There's nothing we can do to pass information from one to the other, I dont see how teleportation is possible of faster than light communication.

Soooo I just tried this experiment,and now my room is filled with smoke and cat guts...

Schrödinger's smile/frown for you - :(:

Ted Ed iniated the idea of entanglement DARK series just delivered it 😍

Legends says cat is still waiting for some one to open that box.

Quantum entanglement pretty much proves monistic idealism, an existential theory that states consciousness is the primary "stuff" of reality and that matter and energy are just a projection. Please read The Self-Aware Universe by Amit Goswami if you would like to explore this concept.

Though I haven't started learning any of the quantum mechanics equations or anything I find it very easy to understand and interpret most of the ideas of quantum mechanics

The last statement regarding cats impressed me 😂

I came up with a model for a new type of computer from playing a game, Counter-Strike (a Half-Life mod) when it was in its original beta phase. The system was very poorly designed, like the accuracy system for the weapons was designed that if you slow down to a walk, your guns were more accurate, but they set the parameters up so that it triggered this extra accuracy just going the slightest speed under a full run. Using +moveup which was meant for swimming in the scripting language, which is the only "language" I used, you could get half way between a run and a walk for movement speed and get the accuracy of a walk and the silence of it, with movement sound being another similar flaw they made in the game. That combined with scripting firing of the gun so it briefly made you do +moveup before actually firing the gun and turning it off immediately after firing the gun effectively gave you a more accurate gun at a running speed. There were many holes in the original CS system, I repeatedly told them about them on their message board, getting repeatedly banned. I remind you: I only used the extremely simplistic scripting language built into the game, so I was exploiting and not cheating, even though in effect it was cheating. CS 1.6 should have been CS 2.0 because they made major changes to the engine due to what I was spreading around. At least one of the hacks that I kept to myself and did not put into my script still exist in the current CS system as far as I know. It was basic to the Quakeworld original engine Half-Life is based on. The script that is part of my work, for CS 1.6, has a fully automated taunt system for giving people a hard time. I built a randomizer and relational database that sometimes spits out a taunt based on the weapon or weapon type you are using just before your gun is actually fired when you fire, only using the one command, alias. Alias just lets you create or reassign a command to an indicated string of commands, and nothing else. We are not digital and nothing in Nature is digital. Digital computers are an exact science with exact results. Nature is based on "good enough is good enough". Oxford quantum physics professor Andrew Steane wrote in his paper about quantum information systems titled "Quantum computing" at arxiv.org/pdf/quant-ph/9708022.pdf : "The new version of the Church-Turing thesis (now called the ‘Church-Turing Principle’) does not refer to Turing machines. This is important because there are fundamental differences between the very nature of the Turing machine and the principles of quantum mechanics. One is described in terms of operations on classical bits, the other in terms of evolution of quantum states. Hence there is the possibility that the universal Turing machine, and hence all classical computers, might not be able to simulate some of the behavior to be found in Nature. Conversely, it may be physically possible (i.e. not ruled out by the laws of Nature) to realize a new type of computation essentially different from that of classical computer science. This is the central aim of quantum computing." From what I understand they are forcing current quantum computers to unnaturally apply a binary state to something that has a infinite evolution of states. Think of the electron and the circle it makes around a nucleus. That 360 degrees circle it makes is infinite in precision, and that movement certainly has an effect on its surroundings. Basically, practical math is the descriptive language of the universe, and not the actual universe because it uses measurements. I propose a "Dynamic Stateless Computer" that operates on "Logic Geometry" based only on connections, or links, or pointers - a much more simple computer than the three basic Boolean logic gates operating on mathematical binary bits that is every computer out there. The shape is the logic and the logic is the shape, sort of like a truth table that is dynamic where the "truths" change as it runs. Quantum mechanics is beyond me, but if this only needs connections, ie a quantum entanglement, can we build a computer that operates and does its entire run instantly? Like I said, all I need is connections to perform logic... no need for information... the shape is the logic. You are best off going to Github and seeing online without downloading the paper and models. When someone looked at my calculators, they accused me of: "You're not doing math! You're emulating math!" Look at the simple calculator first, it only does addition and subtraction. Then look at the complex calculator that does multiplication and division. As you well know, if I can do those things, I can do anything mathematically. In the main model I created if-thens, complex do-whiles, a randomizer and a relational database. github.com/johnphantom/Dynamic-Stateless-Computer Through the exercise of the most complex do-while I asked a question related to that, and the answer uses the ancient Chinese/Pascal's Triangle (which millions have looked at over thousands of years) in a new way: mathhelpforum.com/threads/combination-lock.17147/ I basically had to count nothing as something to count, as in you can have different items to count the permutations of but a default state of no item is possible for each, some or all to count in the permutations, and it doesn't seem anyone else in history was able to use the really basic mathematical concept of the Triangle in that way for the solution. It is similar to the 4 hats and 4 pegs question of how many permutations you can have that is commonly associated with Pascal's Triangle, but they did not count the empty pegs as part of the permutations that they can have. The technique of the implementation is a little interesting, with it being able to reach any of the 209 possible permutations of 4 wheels with 4 numbers (don't know if I should count 0, it is special in this case - if you do count 0, it is 5 numbers) in 4 keystrokes or less - it's how it scales that is the curiosity, where if I had 18 slots and 18 items to form a permutation it would have almost 3x10 to 18th power or 2,968,971,264,021,448,999 possible permutations, each reachable within 18 keystrokes or less. I don't have any idea as to how this would be physically built - none of the aspects of it, except for the dynamic logic that I also do not have any clue if it really is what I ask above. I just can do these things I demonstrate and in my extensive almost 50 years of digital computer experience I have not seen anything exactly like it. Maybe you wonder about my computer experience? I have always been fascinated by computers, starting in 1972 using a prototype Cogar 4 that my dad got his hands on, when I was 3. By the time I was 5, Singer wanted to use me in a commercial to sell the computer, because if a 5 yo could start it, load the OS and then load games, that proved anyone could. My first mentor helped develop Ethernet after working for my father, and allowed me to hold one of the first breadboard ethernet cards developed when I was 10. My first real program (programming since at least 5 if you count the Cogar ASM I had to type to get to the OS and games) was in BASIC when I was 11 that I learned from a manual without anything more than a small example for each command, written with pencil on paper; a rudimentary AI demonstration called "Animals". Second program I made I had another computer (we had moved and left the one at my dads company behind when he sold it) and was a dot bouncing around the screen. Third program, with 12 year old's understanding of math, I attempted to do 3D. I first professionally programmed in 1982, started building computers and networks for a small computer company in 1986 owned by my second mentor, Peter De Blanc who lead ICANN for a period, was an official beta tester and developer for OS/2 2.0 and developed a device driver for it for the extremely complex Truevision Targa+ 64 video editing board (pic: imgur.com/a/hMe21Qe ) directly flipping bits on it in 1991. The code for the model for the dynamic stateless computer is about 640 lines and took me 6 months to complete, with the code for the Targa+ device driver being over 4200 lines and took me one 20 hour sitting that compiled and ran the first time that I have 3 witnesses for. That's almost 30 years ago. My experience has only gone up from there. This dynamic logic is something I found, that I have never seen anything like even searching for it on the Internet for the past 20 years.

"So is the cat alive?" "Yes'nt"

* Dark final season is released * Hmmm, I wonder why RU-vid is recommending me this

If it's related to time , like in space time, the two objects will always gives entangled outcome irrelevant to the distance. So, it does works with space time. And consider it with spring theory.

Does the fridge's light work like this? I have been trying to solve this problem since I was a child

Finished watching dark yesterday RU-vid today:

Netflix dark brings me here.... Anyone else?

For those already initiated in QM I repeat here some comments previously made to similar videos. They may clarify debatable points. The Schrödinger time dependent equation (STDE) when applied to a wave representing an initial state of, say, an electron bound to a proton and together forming a hydrogen atom, predicts and retrodicts all the future and previous states of the electron wave, in the same fashion than the evolution equations of classical mechanics predicts the movement of the Earth around the Sun. Note that the STDE is energy conservative, that is, the initial state as well as the predicted and retrodicted ones all have the same energy. As is well known the bound electron has a completely different conduct. Whatever the initial state and in absence of other interactions an excited electron will settle in a stationary state radiating energy (in the form of a photon) along the way. If the stationary state is the ground state the electron will stay there forever (in absence, as said before, of other interactions). Otherwise the stationary electron state is ephemeral and will be abandoned to radiate a photon and assume a new stationary state of even lower energy. This "down the staircase" process repeats until the ground state is reached. There is no manner to adapt the STDE to this physical process. This inconsistency was discovered by none other than Niels Bohr, as can be inferred from the report of Werner Heisenberg. See our note www.researchgate.net/publication/356193279_Deconstruction_of_Quantum_Wave_Mechanics After discovering the tremendous inconsistency between the equation and the atom it would have been natural to announce that the STDE contradicted physical facts, and ask for a correct equation. I assume as true, but only know from hearsay very long ago, that in Einstein's viewpoint the correct deterministic time dependent wave equation had to be non-linear in contrast with the linear STDE. References to this historical detail would be appreciated. It is hard to believe but, against reasonableness and common sense, Bohr decided to adopt the STDE as correct and that continuity, causality and determinism of physical processes were wrong because they contradicted the STDE. Apparently mathematical equations on paper were more relevant than the experience of the whole human race. Then a series of new and fanciful "quantum physical principles" were adopted. In my opinion the powerful quantum establishment dogmatically defends Quantism and strongly rejects any attempt to correct its misdeeds, even if the correct deterministic time dependent wave equation is available. With best regards to all Daniel Crespin

One thing that always gets me: where is the boundary between Classical Mechanics and Quantum Mechanics? Where does one end and the other begin?

Knowing that one day your cat will escape to a safer galaxy where there are no physicists and no boxes, fills you with determination.

Alright so how do two entities become “entangled”?

Yeah, Imma just say that the kitty design was just adorable

That last part made me happy 😂

Plot twist! We are the cats

The beginning is the end

*No cars were harmed in making of this video*

0:58 whoa, that’s quite a leap in thought