Quantum Entanglement, Explained

Professor Jim Al-Khalili traces the story of arguably the most important, accurate and yet perplexing scientific theory ever: quantum physics.

The story of quantum physics starts at the beginning of the 20th century with scientists trying to better understand how light bulbs work. This simple question soon led scientists deep into the hidden workings of matter, into the sub-atomic building blocks of the world around us. Here they discovered phenomena unlike any encountered before - a realm where things can be in many places at once, where chance and probability call the shots and where reality appears to only truly exist when we observe it.

Albert Einstein hated the idea that nature, at its most fundamental level, is governed by chance. Jim reveals how in the 1930's, Einstein thought he'd found a fatal flaw in quantum physics. This was not taken seriously until it was tested in the 1960s. Professor Al-Khalili repeats this critical experiment, posing the question does reality really exist, or do we conjure it into existence by the act of observation?

Elsewhere, we explore how the most famous law of quantum physics – The Uncertainty Principle – is obeyed by plants and trees as they capture sunlight during the vital process of photosynthesis. Could quantum mechanics explain the greatest mystery in biology - evolution?

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[Armistice]

20:11 In Vietnamese, our phrase for smell includes the word for hear, it actually translates literally to "Hear a smell"

[thedouglasw.lippchannel]

I have learned so much from Professor Jim Al-Khalili. His videos are classic.

[junkercars]

Science documentaries are so therapeutic...it makes me feel like life's problems are insignificant compared to the grander scale

[dylan_curious]

This is absolutely mind-blowing! It's incredible to think that plants have been utilizing the power of quantum mechanics all along to efficiently convert sunlight into energy. The fact that the exoton wave spreads out across the cell and explores all possible paths simultaneously is just mind-boggling. It's amazing to see how the fields of biology and physics are coming together to unravel the mysteries of the natural world. The more we learn, the more we realize how much we don't know. Quantum mechanics is definitely vastly superior to any human technology, and it's fascinating to see how it has shaped the entire living world. Thank you for sharing this amazing video!

[kA-dczq]

I have just read his book" Life on the Edge" . It's a wonderful book. And after reading the book this video is very understandable. But my question is that how the particles have quantum behavior in the realm of biology when they are neither isolated nor in low temperature! In fact, they are monitored or measured by other particles or cells in our body!

[patrickguillory-yygu]

I made an observation with my two little dogs, on Saturday we bring them to the mall and walk them around in the wagon………… Whenever we get close to the mall while driving, they get so excited……..I always wonder to myself, how do they know we have arrived to the That is a mystery to me still to this day ❤😂

[missshroom]

I’m from Michigan and our state bird is the American Robin…I was always happy to see them after winter because they come back in the spring. They have always made me smile around March👍🏼💙🌎

[WarNoMoreMan]

Who ever thought music should be used in this video ruined it. It was very distracting and did nothing but make those sections annoying. His voice was washed out and the info was not as well recieved

[antoniolopez]

Professor Jim Al Khalili, my admiration for the way he explains such complicated things in a very understandable way.

[ewaf]

It's only after I got entangled with my Television set that this video made sense.

My foot got caught in the power cable and I banged my head. Afterwards my mind was up there in lights.

[StephenFletcher-vfim]

I saw this on TV some years back, I was fully addicted because it's very well explained, even I could understand the strange phenomenon of Quantum entanglement. Jim once said " I believe in God like I believe in Father Christmas " A very wise man.

[carolyntyler]

Fascinating video-- Thank you to everyone involved. Next time your sound editor goes to work, ask them to reduce the volume so the voice of the narrator can always be heard clearly-- in some segments, the frenetic music overwhelms. The information is too good to miss!

[r.w.emersonii]

I found a very simple mathematical model for entanglement, tunneling and a parallel universe, and I am so impressed with this gorgeous video that I want to share this neat little discovery. Take a 10 by 10 grid, and fill it randomly with digits between 0 and 9, then add a "wall" that divides the grid in half. Now pick a grid cell, and use the number in the cell as the distance for a jump. If the number is 2, for example, jump 2 cells north, south, east, or west. You then have the start of a number tree, with up to four branches. If the cell you land on contains 4, then jump 4 cells, etc. Repeat till no further jumps are possible without colliding with other branches of the tree. Think of the cells that contain 0 as "dark matter" or "control rods".

In this way, we can transform every non-zero cell in the grid into a tree of cells -- which is a bit like transforming a particle into a wave, or like transforming a photon into a whole tree of entangled photons. We end up with "parallel universes". The first "universe", the grid, is spatial: cells are adjacent. The second, the "universe of the number trees", is non-spatial: the trees are intertwined and non-adjacent. Look at one of these trees: chances are that it "tunnels" right through the "wall". Now change the color of one of the grid cells, and propagate that change through the tree and back: All of the cells caught up in that tree change color together: "entanglement"! Now try to locate a particular cell. If we are looking in "the wrong universe", then we will see not a cell but a whole tree of cells, a whole tree of possibilities. Such a simple model! Maybe the universe is just as simple!

[eddymohd]

With all due respect, Gd Afternoon everyone here. Quantum Entanglement. The Phenomenan that defies all logic. Secret of Quantum Physic/ Progress. This video was uploaded and shown on 17th November 2022 with 78, 756 viewers and 1.1K likes. Fascinating and Magnificient videos. Now it's 30th January 2023. A trip down memory lane. Amazing Throwback. It's approximately 2month ago. 💜🇸🇬🤗🤗✌✌🐾⚡🌻🌻🇸🇬🦋🦋🌍🤗🤗✌✌

[El-upri]

One of the best science docs ever. I keep coming back. Great piece of work.

[skindude]

Astonishingly good explanation of quantum physics, it’s history and relevance. I’ve seen loads of these types of documentaries but this was by far the easiest to watch and understand. Brilliant !

[nickiseb]

All those guy's coming from the BBC house like Mr. Attenborough, Prof. A.Kahlili, Prof. B.Cox.. seem to have the talent to bring a fascinating scientific story in an understandable (beautiful) language.

[urieowrjdf]

Terrific! I learned a lot. Love videos with Professor Jim Al-Khalili.

[videomonkpvr]

Extremely awe inspiring. The Robin's eye is the compass.

[sonarbangla]

Although QM deals with probability and uncertainty, we can observe the role of determinism. Somehow QM is a bundle of rules that fits in an arrangement. Quantum entanglement somehow makes it possible to determine outcome. Physicists like Jim will make it possible to explain how QM makes everything possible. Beautiful explanation.