How to Produce Entanglement 

Really cool to see an actual quantum experiment set-up, rather than the usual analogies / thought experiments. I still find entanglement a hard thing to wrap my head around, but your videos are helping me to get there.

That guy is really good at explaining complex concepts on a basic level without leaving a lot out

of all the things i've learned about entanglement, how to make them in the real world is one of the things i feel are the least discussed... thank you for this

I have a 4 questions. Would you be kind enough to answer each of them. 1) When 2 particles are entangled and one particle spin is measured is it true that both particles superposition collapses at the same time and the two particles have opposite spins? 2) When the measurement ends do both particles revert back to a superposition. Are they still entangled? 3) If they are, can one of the entangled particles be measured again collapsing both there superpositions to have opposite spins? 4) What experiments have been done to answer these questions?

Thank you. This is the video I was looking for. As you say at the beginning they always talk about the entangled particles, but you never know how they got entangled in the first place. Even though it’s difficult to fully understand it, as a non-physicist, it definitely helped me visualize it a little better. Keep it up.

This is one of the few videos that helped me visualize and understand quantum entanglement. Concise yet technical.. Brilliant!

"Spooky action at a distance"

What other particles can be entangled besides photons & electrons? Can we entangle protons & neutrons? And how?

That was the most important question on my mind about entanglement for a while. Thank you for clearing it up!

6:45 "There's some physical process, but we don't know what it is." I'd called that "spooky".

That was the video I was looking for, thank you!

Superb video, love to see the practical nuts and bolts of this stuff. Great channel generally, subscribed x

I've learned something. Thanks! I've never spend much thought about concrete experimental setups producing entangled photons. This video made me also look up more information about non-linear optics.

Thanks for the video,I had seen numerous videos on entanglement,I could not understand it, everyone talked about entanglement, but none talked about how to make engagement , you deserve applause 👏👏👏🙏🙏

Thank you for explaining this. Given how much "spookiness" is attributed to entanglement, you would think more emphasis would be given to trying to understand how it happens.

Why does this video have only 2000 views but flat earth videos have hundreds of thousands of views..?

Great video Ben. Keep up the good work and we'll keep watching.

Just found your channel, thank you for the EXCELLENT video and explanation!!! Look forward to more!!

Ohhhhhhhhhhhhhhhh!!!!!! I’ve been trying to get my head around this for a year now and i finally get it! For shame on all of the “science representatives” (not naming names) for never giving a CLEAR EXAMPLE of QE. Thank you!

Thankyou SO MUCH! As a student with a side interest of quantum mechanics this has seriously helped me understand how all this actually happens. Love the video, keep making amazing content

4:31 "you don't know whether they were created in the first crystal or the second crystal". why couldn't the photon have been affected by BOTH crystals? the first one jiggles it a little and then the second one jiggles it a bit more. BTW, when he says the photon is "created by the crystal" does he mean in the Feynman QED sense where the electron in the crystal absorbs the photon then some other electrons in the crystal re-emits two photons etc etc.?

Very nice and clear explanation. Good job.

Thanks for the vid. The content, and your access to the lab is something I could.never get unless I built it myself... which is why this showed up in my search for DIY Particle Entanglement. Thanks for the education and demonstration.

Thank you so much for explaining how entangled particles are produced I found thi explanation VERY helpful.

Wonderful work. Witty humor, unique perspective & coherent explanation. Keep posting :)

Thank you oh so much for making this, you are my new favorite person. That question has been driving me insane for a while and everyone I ask just ignored my question

I always wondered how so thanks so much

I love your energy and excitement 😄

Excellent video. Finally got an idea of how you can produce an entangled state with photons.

What a great video! I wish I could have access to a lab like that and do some testing on quantum computing

Nice presentation. It would be nice if you talk about Delayed-choice quantum eraser. I always see presentations, but no one showing that in practical.

So very well explained - thank you!

Thanks for this video, was always curious how they even setup to acquire entangled particles, now I get it a little better :) liked and subbed

Was looking for this for a long time. thanks for explaining

Holy cow so many questions! Is it possible to put entangled particles back together? Or combine two separate unmeasured entangled particles together to affect the state of their respective entangled partners? Great video btw!

This is awesome thank you i can't wait to see more videos from ya 💚💚💚🤗🤗

Thank you for this great explanation.

very good description of how photonic entanglement is achieved.

Completely underrated channel

The gentlemen on board did a fantastic Job of explaining.

keep the good work up. we love you!

So Good! Thank you.

entanglement, perhaps the photon which is a packet of energy, simply divides in two similar to cell division, and the energy is still connected through the fabric of spacetime.

what happens when you iterate this process? ie split one "photon" in half and then spit that half again? I would assume you would get a 1/4 of the energy naturally but if they are entangled would you end up for 4 1/4 energy protons or 2 1/4 energy protons and 1 1/2 energy proton? I assume the 1st result might prove entanglement while the later might disprove it or at least show the next split disentangled the photons somehow. I'm sure im missing something but would love to hear anything thoughts on this or any info about running the experiment this way? Thanks for the video.

This is brilliant - thankyou!

I’ve watched two videos and feel like I’ve learnt more than I ever did in 16 years at school.

exactely what i was searching for! thanks

Jacques is amazing. Great videos btw

I've read volumes of stuff about 'entanglement', but I never saw anybody entangle something. This was revelatory. Your question about 'uncertainty' was a propos. Took me 8 years to find somebody to explain it, but I think I get it--to the extent that it can be gotten. Thanks.

Absolutely Brilliant way to explain to my simpleton mind Quantum Physics basics. Your friend in the Lab has a very impressive Charismatic Vibe as well. Anyhow sorry for my uneducated American verbiage

Thanks, great video!

Great video as always! :D

Ok, but what do you do with the entangled particals, after, and how? I read that we successfully sent an entangled partical to the ISS and kept one down on Earth, to see if they would respond to each other. How exactly does that work? Especially if it's photons?

Be nice if you could do something about how wobbly your camera is... but your overlaid animations are pretty cool. Always nice to see science and/or technology videos with a hint of the "ooh-aaar" about them. :)

Finally know what entanglement is; Mind. Blown.

My experience in life explained scientifically. Appreciate

Thanks! Your explanation of entanglement as a system is the most helpful I've come across yet. This video kinda implies that all it takes to produce entangled photons are a couple of crystals and a laser. It is really that straight-forward? Is this something that I could do in my garage? (Not that I'd know what to do with entangled photons even if I could produce them.) Or is the equipment actually more complicated and costly?

Excellent upload .. thank you :)

Excellent thank you !

Well, I got entangled with a married woman. Then she went and told him which broke the wave function. Then he came round and broke my nose.

That was bloody great...thanks heaps for explaining how particles can become entangled. Question: Can electrons, protons, neutrons, etc also become entangled?

thank you so much other videos didn't explain what created the entanglement new subscription

Having a certain set of rules that partly, however little, interferes with itself (I’m thinking about the infinitely fast information teleportation) seem to show us that things that are interfering with our almost perfectly closed system can still be valid - after we have given up believing in the overlapping section that nothing can get from A to B faster than light.

Fresh batch of entangled photons coming right up!

That's something I always wanted to understand. Another would be How they actually isolate one photon or particle to do these experiments (Split, particle coliders and such)

Very good! So this only works with photons. How do you know the photon had a random spin before you measured it?

Great video, but can I suggest you use youtube's stabilizer, I don't know if you are using it, but it's a little shakey

Watch out Brady Haran! Periodicvideos has got some serious competition! Great editing again, the fixed annotations are awesome and you asked just the right questions. Good explanation too, even though it seems really hard to control this for computer purposes. Then again someone "trapped" light recently, have you heard about that?

yes this is a lot more complicated to understand that what we usually see in documentaries, that is why i need this sort of info to actually understand what hosts of science shows are not saying.

The most read article in Quora on the Conundrum of Entanglement as of Friday 6th Feb 2018. Below is brief summary. For the full details click on the link below. Entanglement: When two Subatomic Particles share the same Spacetime code they become entangled. As experiments have shown that two entangled particles act as one system as if they are communicating with each other instantaneously. If this is the case, then it’s reasonable to conclude that the data stored in the Cosmic Database are indexed in accordance to their “Spacetime codes”. So any update to one record leads to updating both records. Based on this postulation, we suggest that any change in the “Cosmic record” of an entangled particle must lead instantaneously to a change in its observed physical quantum state. It also lead us to conclude that the act of entanglement is necessary for the conservation of momentum, symmetry and and other relevant information. These suggestions support the possibility that we are living in a Holographic Universe. The Measurement problem: The observed wave functions of Subatomic particles are due to the nature and characteristics of two Basic Energy Particles responsible for their existence. The particles at the quantum level could be in any one of several states until they are measured. The act of measurements leads to their recognition in terms of cosmic information in that specific state at a given cosmic second. In the double slit experiments, to explain the collapse of the wave function we speculate that as photons interact with the observed electrons. They instantly share the same “Spacetime code” which make them entangled. Once an observer capture these photons (in the act of measurement and recording of the data) a new space time codes are given to the photons. This leads to the cessation of the state of entanglements as the photons no longer have the same spacetime code of the observed electrons. In response to erasing the act of entanglement, the observed electrons reset themselves by getting their energy cloud collapsing in readiness to start a new cycle of spins.This is done to preserve the law of supersymmetry. Consciousness and data recording: It is suggested by some physicists that the act of observations through effective meditations lead to the collapse of the wave functions. We speculate that such trained meditators are able to concentrate, capture and register the information carried by the entangled photons in their memories. This act of recording by the meditators constitutes particles interactions similar to capturing the data by measuring devices. Such interactions lead to the resetting of the relevant entangled pairs, hence the collapse of the wave function. This makes us an interactive players in the quantum information collected and recorded. docs.google.com/document/d/1qpnegrI9ox0gBRnN-jvA0PXHgcbpAdhwwpS__eBocq8 Mnafousi@gmail.com

When you say horizontal and vertical light, is that the same as "spin up-down" and "spin left-right"?

Can I do same experiment at home using laser light and Polarizer filter or crystal that generally used in LCD screen / DVD Lense or we need more stuff to do this ?????

I got nearly all the way through but finally HAD to stop to point out that there appears to be a crap band that follow you everywhere you go. Maybe you haven't noticed them - maybe they disguise themselves as janitors with mops and buckets or the mail delivery guy - but I PROMISE you that every time you are busy talking, one of them gets out a crappy organ and another gets out his crappy percussion, and off they go again, playing some none-tune and no doubt wiggling their hips a bit, as if to mock you. Of course, this reflects great on you guys because it proves you are so passionate and into your subject, that even if ACDC kicked in with Whole Lotta Rosie, or that guy from the 80's who sang "what's a matter you, HEY, gotta no respect...... (Ah shaddappaya face) (Ask you parents) - him - I don;t think ANY piece of great music such as those could possibly distract you from whatever it was you were on about - I;ve clean forgot because I was so distracted by trying to imagine WHERE they bought the sheet music from - a 1920's mexican "Tin pan alley" type of outlet or a pound shop in Bolton maybe? - I considered everything except the possibility they were just making it up as they went along. It's FAR too good for that - No-one could possibly improvise such a unique combinatioon of greatness and blandness that just, somehow, WORKS! ANYWAY! Sorry to go on ... I hope you don;t mind, but I made several cassette copies to give away as Christmas presents, hoping that this kind of music hasn't gone out of fashion by then. uNFORTUNATELY, NOW i HAVE TO LISTEN TO YOUR VIDEO AGAIN so this time I can concentrate on the words. But IF you by any chance have a copy WITHOUT the brilliant music, PLEASE PLEASE PLEASE make it available ... EVERY physics video is accompanied by the most brilliant music ever made (and when I say "brilliant", to be absolutely honest, I mean diabolical) - It makes learning that much harder - because some of us love music as well as science. You guys are great ... but if you DO see the janitor carrying an unusually big guitar, huge hat and Mexican tash, knee him in the balls for me - H'e not REALLY mopping the floor. He's trying to get famous, hitching a ride on the back of physics videos. Fucking clever, but a bit cheeky if you ask me.

Very interesting, thanks

Are the photons that emerge from a single crystal (with one type of polarisation) still entangled in principle? I know he said they weren't entangled in a 'useful' way (because the process wasn't adequately exploiting superposition, hence the need for two crystals), but I couldn't discern from his explanation whether they were/weren't actually entangled from being produced through single crystal. Any thoughts?

When describing the entangled state with the drawing, what if you were to repeat that process again with photons that are already entangled? Eg: placing two more crystals on each end of an entangled photon? Unless that wouldn’t work and I have no idea what I’m talking about..

Hi, I was wondering if the two entangled particles are the same frequency, does that mean if you increase the frequency of one particle the other decreases or is it only the spin that is effected by entanglement ? Thanks

good video on a very complicated topic

Have fun in America, I've been a few times and it's an awesome place to visit. Ever think of coming up to see Canada?

How can you pump 400 nano meter light and get 800? Am in missing something.

Sweet! But how does one find the right pair? I mean, it might as well be two different photons right? Or is there only one submitted per shot? And, how is the photon caught and preserved over time?

so if we measured the polarization of the photon, then another thing about the same particle, let's say the wavelenght, and then we measured the polarization again, cuold the polarization change?

Ben I have made an assumption in my readings on QE and that is that the measurements can be continuously applied ie: Entangled photon A can be measured and the spin noted then reversed a number of times will Entangled Photon B's spin be continuously reversed in conjunction wit A's???

What happens to an entanglement (A) between those split photons when I split one of the photons again (B). Let's assume it's in the same mode (on a same property of photon). As there can be only one entanglement per mode? Does the entanglement A disappear?

Wowww! I finally found what I'd been searching for... Thanks!! But the experiment gave rise to another question in my mind... aren't quanta discrete? How could you split them? (please don't mind if this is a silly question, I have just started learning quantum mechanics :D)

Can you please tell me some information on the sculptures in the background at the start of the video

What is the sound at the end of the video (7:22)? Is there a place where I can find more?

Thank you for this video! I'm not gonna say that everything's perfectly clear now (it is quantum physics, after all...), but it's definitely better :)

it sounds like the particle that is split at the time of the measurement is actually just showing a set type of frequency or state that has to be on the opposite side of the measurement spectrum on the other side, if you split it three ways or even four wouldn't they each show a different position on the other equal side of the spectrum.

What about conservation of angular momentum? The input photon is "hbar", but the output photons total 2*hbar. How does that work?

ok so lets see have I understood this! SO when the lazer fires the photons out are you saying that when they get split into two photons they are still connected to each other by an invisible force? So that essentially they are still one but just split????

Once you create this particle, how do you track a single photon (or pair) to do anything to it? It doesn’t have an address, you can’t save it, and it’s traveling at the speed of light.

Well done sir

Loved yr video ❤️🤩

can you please explain what would happen to a horizontal photon if he will goes to crystal 2?

When we talk about entangling two particles, does it really mean just two particles ...or is it a proportional number of particles that cancels down to two ? Does tat make sense ?

Great video. It begs the question though, how are quantum entangled photons measured?

So, with the way AI is going, I’m sure it can (or soon will) be used to figure out which Crystal as used and if it’s an H or V photon, would knowing change the outcome? Sorry if it’s a silly question.

So I understand that if a particle goes through the crystal two particles are created and then are entangled. But what happens if we take those entangled particles and send one back through the crystal? Will it split again into an even smaller particle (1600 microns?)? If it does split, then what happens to the other entangled particle? Will it automatically be affected by the entangled particle and also split?

4:41 | HH> + | VV> , there are four photons here right? If so, then the H with H are in entangled state? Or the HH photon pair is entangled with the VV photon pair?