Quantum Entanglement Explained for Beginners | Physics Concepts Made Easy
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- เผยแพร่เมื่อ 21 ต.ค. 2019
- Want to understand quantum entanglement more deeply? So did I, so I made this video :D
Hey everyone, I'm back after a long time, with a video on quantum entanglement. A lot of you have asked me to discuss this topic, and I am more than happy to because this goes into the stuff that I would say I'm most interested in.
Now there are lots of videos about quantum entanglement on TH-cam already, but out of the ones I've seen they're either a very conceptual and qualitative discussion of the concept, or the equivalent of a lecture for undergraduate physics students. I wanted to bridge the gap, so those of you with a real keen interest for physics will be able to understand it (hopefully), but while also including some (minimal) mathematics too, in order to get a deeper understanding of the phenomenon.
Most entanglement videos discuss the concept just using Bell States, which were first discussed by Einstein, Podolsky, and Rosen, in their paper on the EPR Paradox. These states are special cases that allow us to understand what an entangled quantum state is most easily, but they aren't the general case. I wanted to discuss the general case here, and what it specifically means to have an entangled state.
To do this, we first needed to understand that quantum physics tells us that an isolated system will be in a superposition of all possible states, so I described this in brief detail. This is really one of the first mind-bending ideas we come across when learning quantum physics, and I'd like to go into more detail about this in a future video.
I also used bra and ket notation (which is the commonly used notation used by quantum physicists) in order to show you exactly how quantum physicists would see all of this mathematics, and how they would go about navigating it, but hopefully it isn't massively distracting or overly complicated. If it is though, drop me a comment down below and I'll be more than happy to answer any questions. Also, if I've made a mistake then do let me know down below too as I'd like to correct it!
Lastly, thank you all for 20k subscribers! It means a lot to me. Over the next few days and weeks, I'll be working on a vlog for IGTV, which was filmed when I went to New York for a holiday. Keep an eye out for that by follow me on Instagram @parthvlogs.
Thanks for watching, and I'll see you soon!
I am in a superposition to understand and NOT understand this at the same time... Cannot wait to collapse into the state of understanding this.
Try watching this while high! I understand perfectly.
I see what you did there.
Yes, but its 50/50 and you won't know until prof does measurement when he gives test.
@@joeboxter3635 😂😂
😂😂
I like that he isn’t afraid to show the math and look at how it works. Seeing the actual equations feels better than someone just telling me that math tells us these things
This in a way is really funny cause that’s so true
Mathematics are the language of physics, that's why
And it made it easier for me to understand than other people using weird objects spinning.
How can you form mathamatical formula's for something that is beyond our comprehension
David Walker lol because the probability waves are measurable and the formulas match with measured experiments. Basically how all science works. The universe existed and worked mathematically long before there was anything that tried to comprehend it.
I am a chemistry graduate, and every time I see a new physics video of yours I feel like reuniting with an old friend I haven't heard for a long time. I already left a comment under a post you wrote a couple of weeks back, but I just wanted to make sure that you read this: your work here on TH-cam is deeply appreciated, keep it up!
"im in shock" DONT BE you are providing very good content and its your ability to explain stuff simply. I thank you. PS love the joys of Wave Functions.
Thank you so much! :D
Finally, a channel that isn't afraid to delve into the math!
Excited for the next video, but not as excited as I am for you to finish up Maxwells equations!
Keep up the good work 🙂
If you like the math, I highly recommend the channel viascience
I'll have to watch this several times but... yeah!
I really love the fact that you used actual equations to show what you're describing. Most videos on these subjects just try to make analogies and animations so that they are more easily understandable, but your explanation is the best in my opinion.
This channel is the only one that I watch that has videos I have to pause and rewind to understand everything. It is challenging and interesting at once.
For someone like me who is really into quantum mechanics but could never afford the university fees to indulge my curiosity. Thanks Parth. To share knowledge freely is one of the things still holding us back. you have inspired a generation buddy.
Please keep it up!
Your financial situation should have no bearing on learning.
and im learning tons here.
so Thanks again Parth. your the main man on my laptop now. lol.
Quantum state is a metaphor for the fact that you have all options available until you pick one. #Freewill #choosewisely
This is what brought me to this video
i am here to understand how Jonas is still alive in his world.
Same here 😁
Same here
thought i was alone hehe
😑😑🙃🙃🙃😑😑😂😂😂😂😂😂😂
Thank you very much! I've been circling around this topic for a long time. Not having a background in math, progress is slow, but this video really furthered my understanding quite a bit. I especially liked the fact that you first described the general principle of entanglement and only went into the Bell state after that. The books/videos I've encountered before all skipped straight to the Bell state without identifying it as a special case. To me, the route you took is much clearer. I'd say you nailed it as far as bridging the gap is concerned. And no need to apologise for talking to long, it was very well paced. Please keep up the good work!
the characters "I and > "is called a KET , like bracket and there is a bracket called BRA for other quantum equations to.
very few videos on youtube take the time to explain this. it's refreshing to see your videos!
Hi Parth, i have been scourging for resources and videos that would help me understand this concept of entanglement better and this video was precisely what I needed, with just enough (and simple) mathematical representations. Thanks a bunch!
I love the way you present the math in all of your videos! And you calling it high school math is a very accurate depiction! I love it thank you so much you make it incredibly easy to follow along
Understood it finally . The best lecture . Feeling enlightened
I was really interested in physics during school but after school in college i lost touch gradually but really your content got me back into it a bit and this was really the best explanation I've seen for quantum entanglement by far.
The way you are explaining is great!!! Really loved it.
Good lighting! Oh, and great presentation style. Sorry, no questions about entanglement. I like how you made the math simple to follow.
THIS IS TOOOO GOOOD WAS SEARCHING FOR SOMETHING FOR SOOO LONG TYSM.
That was a surprisingly clear explanation considering the math behind it. Good job!
Wow!. I have very basic quadratic equations and probability knowledge but this explanation was crystal clear to me how quantum entanglement works. Amazing!! Thanks for making it simple. ☺️👍
I actually understood way more from your graphics and explanations than from other videos - sure I don't get most of it since I stuggle with common physics but still, your video is a very good help even for non native speakers.
Great, I like the way you clearly explain things for the layman. You have a new subsriber
He really does it
But he wanted a subscriber
Amazing ! perfect for licence degree and now my master to keep having the big picture of all the stuff we are then adding when you go further in quantum physics
Thanks for explaining this! love your videos!!!
Amazing video! Truly incredible content you are making here!
Excellent video and very well narrated. Great work.
love your channel dude, keep it up :)
According to me this was probably his best video till date
very well explained. Thank you for keeping the Maths, because entanglement can never be really understood without understanding the Maths behind it
Mathematical explanations are very welcome. Thank you for this magnificent video.
The coefficient term with its complex conjugate (squared) is the probability, but this is important to note; it is *not* the "probability of finding the system in that state" as you mentioned. The language here is important, so more precisely it is the probability of the system being in that state after a measurement (and/or interaction with some part of the environment) is made on the system.
You’ve genuinely made my life better
Hey congrats on your 20k+ subscribers! Make that 20,001 ;)
Love the approach and the willingness to get into the weeds a little!
Simple and clear!
Thanks🧡
Ok, so 2nd video of yours that I've watched... Subscribed!
I love finding old videos of people where they were shocked and grateful at their subscribers being a certain amount then look at their subscribers count abd it's, double triple or quadrthe amount now. Was at 20,000 now you're at 104k. Life is wild, but I'm happy for you.
Keep up the good work!!!!
Physicist here, but have not done any QM for 40 years. A better explanation that in any of my classes. I did remember the bra-ket notation though.
Hi, since minute 10:40 more or less, the chart of equivalences between the parameters and the letters contains a mistake. d=beta x delta, and not beta x gamma. Thanks for your videos, you're fantastic!
Can’t wait for the video on spin!
Another good one Parth 👌
really nice explanation man!!
I love these quantum mechanics videos. They’re really interesting and tie into my physical chem 2 class right now. Not trying to call you out Parth but I did find that you had a small math typo around 10:45 the last d=βγ should have said d=βδ I know it’s such a small correction but I wanted to bring it up. I really like how you bring up the math. You’ve really solidified my understanding on the notation and the wave function so thank you very much! Cheers
that was really helpful,thanks :D
Me 5 minutes into the video:
Ight imma head out. You win this round youtube
LOL. Can I follow you? I think Ill always know I'm intellectually not alone. :-)
Fantastic job mate
Hey Parth.. Yet another amazing video. Could you please make one on Fourier transforms as its applications are plentiful? Thanks a bunch, keep physicsing 👍🏻
Fantastic explanation of complex topic with simple maths
thanks for putting this up. I understood this video more than what Feynman tried to explain.
Om Vedant Chimmalgi that’s a bold claim
Ploop Ploopploopboop you clearly don’t know who freynman is then? Try research before you comment
Thank you for this video. Most of the videos talking about quantum entanglement, only say when the first quantum is measured spin up, the other quantum is always measure spin down (or up, and hence part of my confusion), and I could not comprehend what's the big deal about about that at all. After watching this video, my understanding is that the mentioned scenario is just a special case among others (not sure if this understanding is right or not). Your work helped me further pursue the quantum world. Thank you again.
Appreciate the excellent video. By doing the math, you are showing us theoretical physics, which then makes experimental physics more understandable.
Nice nice work dude! I'm following :-)
Parth you are just awesome... you explained to be clearly what entanglement is.. it is just a mathematical construct :)
When Parth goes blurry it's not because his camera has lost focus, it's because his phase is changing. Or maybe it's just because you've lost focus.
Amazing Job...
You have a new subscriber...
Love your work...😊😁
Thanks you for your professional effort! Quick question , have you heard about a state called "quantum entanglement with the earth's magnetic grids" ? , ( it comes from the theory of migrating birds capables of watching this lines to get oriented while traveling)
this made complete sense to me very good video
Dont be shocked.. Man you deserve this! :-)
Hey, I am really very glad to be a part of your journey and learn something that I will too learn while pursuing majors in Astrophysics and Astronomy. But currently I am in IB board. My only request to you is that can you give me some tips about how and what do cambridge interviewers want to see in their candidates? Pls
This is a great video and you are pretty clear, the only thing i was thinking about is how fast you are speaking making it a bit hard to follow along, i was able to understand everything and u did a great job explaining, well done!
GREAT VIDEO! good job
Sounds like I've heard it while watching about Quantum Computing.. Can you make a video on that too please..!!
By the Way, love your videos and the way you explain things..!!
Okay, I know this video needa watch now
Thanks for the informative info Mr Parth. I would like to ask, What do you think about the theoretical connection between consciousness and quantum entanglement?
Perfectly clear...
..More
Over.. the result is 💯 percent same..if we talk or anylise two really
Entangled souls..
(Of two persons..)
Simply..
No coincidence!
I’ve seen a lot of videos explaining QE, but this is the first that says what it actually is..
sick stuff, subscribed
I love all of your videos, thank you for sharing. Could you please make one about quantum zeno effect thay would be great.
Excellent presentation. Excellent diction.
This is the best video on TH-cam for kids like me.😃
Absolutely amazing explanation.. Thanks.
Came here after watching DARK..
I’d love for you to explain how electrons get entangled, how to maintain entanglement, AND, most importantly, how can you tell if they are still entangled?
This is the kind of physical and practical information you never hear anyone talk about at all.
Good job bro thanks for the information
Awesome videos 👊🙌👍
Could you please explain Bell's experiment? Lasers and filters... Cheers! Thanks!
Can you create a video on how exactly a quantum computer works?
Very good explanation.
Loving the videos. Clear explanation and can (just about) follow the maths. One small request - could you make your figure "2" a little less 'loopy'? I keep thinking it's some sort of Greek letter rather than a square or square-root signifier.
That was easy to understand keeep doing videos more complex if you can
You earned a new suscriber :)
Intelligent, handsome, and amazing elocution ... the last few seconds made me chuckle too 😆🤭
Honestly, it was super good! even a 16 yr understood, yep that's me, ly man! THANK YOU SO MUCH :')
I’d recommend watching the double slit experiment to understand a little more about this; its crazy to think that what is most rudimentary to us, is the most perplexing
Hey, great video!
However, there's something I didn't quite understand. It seems like the separable state at 11:09 and the entangled state at 13:49 are exactly the same but only with different coefficients ?
For example, if you take the entangled state (13:49) and choose all coefficients equal to 1/2, you can factorize it in the exact same way as the separable state (11:14) by taking the coefficients equal to 1/sqrt(2).
Great explanation, for those who are not in a physics major ( I took an engendering master's degree ) i can recommend 2 excellent books that cover pretty much everything regarding modern physics (On a superficial level, of course, but they are not bed reading books either):
- Revolutions in Twentieth-Century Physics - by Griffiths
- Quantum Physics: A First Encounter - by Scarani
These will give you valuable insights on what is going on with physics for the past 100 years.
Great videos!
Your content are best.
could you also describe how you got those conditions for the probabilities of the "rejigged" states after measuring particle A.
Great video! Would love a follow-up on how two particles can become entangled in the first place
If they are in a state of well defined total angular momentum. For instance
The video is more way easier than reading the book
Thank you
Really great.
Can you post something on entaglement entropy and how one can obtain that?
Quick typo: at 10:20 d should be equal to beta * delta :) also thanks for this video. Currently doing my senior thesis on quantum entanglement of photons and i've been trying to wrap my head around entanglement and this gave a pretty clear mathematical explanation for entanglement. I think you should have covered though the more physical aspects. Like WHAT actually causes entanglement. What physical setups in the lab can you make that will create particles to be in these entangled states etc! new video idea? :P
Hey .. could u please tell me... which software or app have u used for editing ua video...i mean i just loved it... it's phenomenal 💖
Finally someone is using maths
I was thnking that perhaps when you explain ket up and down it may perhaps be easier for someone watching to think of up and down as one being in relation to the circular spin as being wider or ket up; or the height direction of travel coming down in elevation in relation to observation as down ket or vice versa. I'm not sure if I misinterpreted your connotation please feel free to let me know. Other than that very informational and well put together
Entanglement is a refinement of the wave function. Meaning spin up and spin down are separated in the wave
I have a question, what make or what is the cause of two electron (or the system if you want to generalize it) entangled?
Seems like you could think about the superposition of states as a car tire rolling down the road. It could be turned in every orientation, but when you take a picture of the tire, the photo will be of the tire in one orientation.