Quantum Spin (1) - Introduction

[High School Level] - An introduction to spin 1/2 particles. I discuss states, bra/ket notation, measurements, probabilities, and quantum measurement collapse.

[shroomskaiev]

Thanks I have seen this whole playlist. let me explain : I failed my quantum physics study and I abandonned education because I thought I would never be able to grasp concepts like spin.

Thanks to you two decades after my failure, I got to my attic to take back my books and for the first time I understood and even manage to get the easy to medium exercices done.

Really, you gave me my self esteem back.

God Bless you. 😉

Greetings from France and sorry for my probably broken English

[camyeo]

This is a life saver! I have a quantum mechanics exam at 9am tomorrow and this cleared up all those gaps in my knowledge that my lecturer wasn't able to fill. Thank you so much!

[me_llamo_la_cucaracha]

I’ve looked at many references on this subject. This is by far the best explanation which I was able to follow step by step. Really appreciate the time you put into preparing this video.

[mississippijohnfahey]

It's hilarious to me that this is high school level for some people... I have a BS and this is right at my level of understanding 😁

Thank you for explaining it this way! I learn really well from nice, thorough explanations like you have done here. I'd like to make a resource like this one day that incorporates math, classical and quantum mechanics, and modern chemistry into one self-contained resource, so people can teach themselves with no more prior understanding than an (average!!) high school education.

I can't wait to watch the rest of the series--I've always wanted to understand spin better. Thank you!

[stevewhitt]

I have been studying QM for years, but I am still getting a deeper understanding from you.

[ninaberezowska]

Thank you so much for the video! I've been struggling in my quantum mechanics class because the professor never breaks down the things that should be simple like you did in this video! Cleared a lot up for me thanks so much

[unboxingenigmas]

this is how professors should teach in school. thank you so much for your great works.

[anonymous.youtuber]

You made me see through the different notation and now it suddenly is understandable. Before that I had the feeling I was never going to get it. Thank you so much ! ❤️

[sakuranooka]

In the example starting at 51:00, I think it would make sense to explicitly point out that everything is done in z_up, z_down basis

[xmeansnop]

Bro. Cool Playlist. Thank you for making it. Worth watching.

[saifahmad]

awesome awesome the more i thank the lesser it would be please keep uploading . i will see this channel till i die, THANK YOU NOAH!! very very much

[puzu]

Oh Bro, I m just watching your videos. I m impressed.

[Forever._.curious..]

I was crying 😭 to get this 🥺😻😻 Thank You so much ❤️ nature bless you 🏞️

[vorsankoy]

Thank u so much. I like the way u explain from simple to advance. "18:38 idk, I think it looks a little cooler"😀😍

[georgelane]

Ponytail, closed-toe shoes, safety goggles - lol!!!

[KipIngram]

This is nice coverage - I think you're really supplying it at a good level. I will be honest about one thing, though - I find all the "I know this is a lot, but..." and particularly the "grown ups do it like this" stuff wildly annoying. And there is *absolutely* a reason some of these things are written as column vectors and others row vectors - it's done because that makes the standard matrix multiplication process do the right thing for you. Vectors and dual vectors represent *different things*, and they need to be notated differently to keep that straight. It's the same idea as using subscripts for covariant tensor indices and superscripts for contravariant indices - there are two different types of things in play and you have to make that clear in your notation.

But, I really mean this comment as praise - it's hard to find this stuff presented *well*, technically, on YouTube, and I think you're accomplishing that, so... nice job, man.

[bastiane]

I really enjoyed this video! Many thanks for this explanation :B

[wilfredoaldarondo]

Professor, I hope you could read this comment to the end. Very helpful! You are a very good teaching professor. How old are you? I think your videos are short, simple, at the right speed for me to visualize the concept without seeing the video two or more times to understand, and there straight to the point. Thanks a lot for your teaching style. I have a question and suggestion for one of your future videos: how has been the evolution of the maths for these quantum mechanics and particle standard model theories? Are the spin mathematical expressions in continuous adjustment to keep up with experimental data or are there principles of physical laws and symestries such conservation guiding physicists and mathematicians in developing new theories to be proved with experimentation? How these math expressions came out in the brilliant minds of theoretical physicists? I am 56 years old and I have always love physics.I have a degree in engineering but I am trying to re-learn the rules of linear algebra, matrices, vectorial algebra, and Einstein's summation. Visualizing abstract spaces used in physics theories is a challenge. I am sure you will be able to explain it in a different and easier way than others to people like me.

[Teeh]

It's MY sleepover and I get to choose the movie

[stephenrothman]

I’m missing something basic. In the 3-dimensional room where you do an experiment, the choice of what axis is the x axis is arbitrary. So how can the numbers that make up the matrices for measuring something on the “x, y and z axes” be different from each other?