Quantum Entanglement Explained for Beginners | Physics Concepts Made Easy

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 YouTube 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!

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