How to Produce Entanglement

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  • Опубликовано: 5 янв 2025

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  • @john-alanpascoe5848
    @john-alanpascoe5848 10 лет назад +194

    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.

    • @DrBenMiles
      @DrBenMiles  10 лет назад +16

      Awesome! It always helps me to see the concrete example so I thought it was worth showing! Thanks John-Alan Pascoe!

    • @whatzupearthlings
      @whatzupearthlings 7 лет назад +1

      John-Alan Pascoe I feel the same way

    • @ald2366
      @ald2366 7 лет назад +2

      whentheappledrops so these non-linear crystals. Can you buy them? Can you find them naturally in nature?

    • @stevebrindle1724
      @stevebrindle1724 6 лет назад +1

      same here, when entanglement with opposite spins was explained in other videos it never explained how entanglement was achieved and i found this very confusing as, i would like to think, an intelligent layman. This video helps a lot. I am getting there!

    • @westechmedia4567
      @westechmedia4567 5 лет назад

      Yeah - it was absolutely brilliant.

  • @GeoffryGifari
    @GeoffryGifari Год назад +28

    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

  • @jhyland87
    @jhyland87 6 лет назад +34

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

  • @Jaggerbush
    @Jaggerbush 2 года назад +2

    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!

  • @billyaviles9098
    @billyaviles9098 2 месяца назад +1

    I can say this is the best video I’ve seen explaining quantum entanglement. I feel every other video tries to build the mystery instead of simplifying the explanation like you did. Props. Thank you 🙏

  • @philo5923
    @philo5923 4 года назад +16

    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.

    • @taziefahmed9750
      @taziefahmed9750 Год назад +1

      bro finally some one actually explained what entanglement really is, allthis time ive been thinking it must be a big secret cuz no one was explaining it

  • @Dwayne_Green
    @Dwayne_Green 8 лет назад +90

    "Spooky action at a distance"

  • @Nitrogearhead
    @Nitrogearhead 8 лет назад +203

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

    • @Witchdoctor707
      @Witchdoctor707 7 лет назад +2

      Benjamin Mace thank you!!!!!

    • @iciman100
      @iciman100 7 лет назад +3

      ask galileo

    • @iteration2
      @iteration2 7 лет назад +15

      Because real science works by the intermingling of millions of minds, all working different angles on problems, learning from different sources, and distributing knowledge.
      Conspiracy theories work by a handful of people producing some bullshit that's just convincing enough to compel a bunch of undiscerning idiots, who all then refer each other back to the same source in order to corroborate each other's beliefs.
      It's like comparing a healthy and diverse gene pool to an incestuously inbred one.

    • @Lexyvil
      @Lexyvil 7 лет назад +1

      Because people love to click inaccurate videos to see how wrong they are, for entertainment. I avoid checking videos that I know are not objective and have no proof because that'll just bring credit to the uploader's invalid points.

    • @pequalsnpsquared2852
      @pequalsnpsquared2852 7 лет назад +6

      Because nobody watches flat earth videos because they believe in it, they just like seeing how dum other people pretend they are. Basically, its just a collection of people pretending that they believe in something because they have no other reason to make friends.

  • @michellefernandez805
    @michellefernandez805 4 года назад +15

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

  • @silvergalaxy.
    @silvergalaxy. Год назад +2

    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

  • @evenaicantfigurethisout
    @evenaicantfigurethisout 5 лет назад +8

    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.?

  • @darrenrissler3493
    @darrenrissler3493 5 месяцев назад +1

    This was very informative. 9 years old, wow. Well explained. Most skip to the entangled state and what science and technology can do with it. While the entire time I'm asking myself, how do you entangle? I guess I'm late to the party but appreciate it nonetheless.

  • @irwinluck7419
    @irwinluck7419 3 года назад +6

    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?

    • @farukhalisilegagtv4205
      @farukhalisilegagtv4205 2 года назад +1

      1- imagine that you have one pair of work gloves. your daughters made a prank on you and ship one of right or left glove to canada. in order to find out which of the glove your daughters send to canada, you only need to check the the you have, or you can fly to canada, pick up the shipment and check it. both ways give you information about gloves.
      2- as we know so far information cant be destroyed.

    • @carlo70no
      @carlo70no Год назад

      Yes, No, - -

    • @ashutoshgautam3293
      @ashutoshgautam3293 16 дней назад

      @@farukhalisilegagtv4205 this way u only get to know the state of one thing, not really affecting the state of that thing, by just looking or knowing another thing at distant location.

  • @ananinamigariyaw2
    @ananinamigariyaw2 7 лет назад +4

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

  • @theultimatereductionist7592
    @theultimatereductionist7592 5 лет назад +12

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

  • @theultimatereductionist7592
    @theultimatereductionist7592 5 лет назад +14

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

    • @clint330
      @clint330 3 года назад +2

      yeah that was a bad line.... we don't know that there is a 'physical process' behind it. we've proven there are no hidden variables as Einstein had thought so it isn't that. it's just.... quantum mechanics... superposition... and quantum mechanics doesn't 'give' an explanation, it just predicts probabilistically the outcomes.

    • @ChaojianZhang
      @ChaojianZhang 3 года назад +1

      @@clint330 +1 we don't know that there is a 'physical process' behind it

  • @kumarswamymc433
    @kumarswamymc433 2 года назад

    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 👏👏👏🙏🙏

  • @matt-g-recovers
    @matt-g-recovers 2 года назад

    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

  • @GreenLight11111
    @GreenLight11111 4 года назад +3

    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????

    • @DrBenMiles
      @DrBenMiles  4 года назад +3

      Hey! Sort of, yeah, though I'd be careful about thinking of them as the same thing. They share some property linked between them (spin), but they are two distinct objects, and they have half the energy of the original photon

    • @GreenLight11111
      @GreenLight11111 4 года назад +1

      @@DrBenMiles ok thank you! So now I need to find out what spin is! Best vid yet Ive seen.

    • @GreenLight11111
      @GreenLight11111 4 года назад +2

      @@DrBenMiles also how do you know they have half the energy than the original?

    • @DrBenMiles
      @DrBenMiles  4 года назад +2

      ​@@GreenLight11111 hey, just saw this. Easy answer is, you can measure them, and see they come out as the same wavelength (colour). That's just because 1.)energy has to be conserved and 2)theres no preferential mechanism to give one photon more than the other as they are emitted simultaneously.

    • @GreenLight11111
      @GreenLight11111 4 года назад +1

      @@DrBenMiles Thanks ben! wish i had done physics back at school! ok one last question - so what colour is it? ie the same wavelength you mentioned? when reduced in energy what colour are they?

  • @hueyandmo
    @hueyandmo Год назад +2

    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.

  • @phoenixpv
    @phoenixpv Год назад +2

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

  • @omsingharjit
    @omsingharjit 5 лет назад +1

    4:37 why he wrote HH and VV ( Or HV and HV because of superposition) instead single H And V !! 🤔

  • @LTzEz03z
    @LTzEz03z 6 месяцев назад +1

    Wait wait wait, @3:00, if both photons come off to the same side… “physics doesn’t like that”… what happens? What happens when physics doesn’t like something???

  • @JD4-70
    @JD4-70 2 года назад

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

  • @chriscon22
    @chriscon22 10 лет назад +4

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

  • @theultimatereductionist7592
    @theultimatereductionist7592 3 года назад +1

    THOUSANDS of YT videos and websites ALL saying EXACTLY the same stuff, covering EXACTLY the SAME material.
    But NONE of them answering OTHER questions. WHICH KIND of particles, OTHER than electrons and photons, can become entangled?

  • @legoman6049
    @legoman6049 5 лет назад +2

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

  • @andybaldman
    @andybaldman 2 года назад +1

    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.

    • @DrBenMiles
      @DrBenMiles  2 года назад +1

      Create question. Thats what makes dealing with light so hard. You need to do your "operations" or computer logic on photons in flight. You measure them only once, when they arrive at the detector

  • @GeoffryGifari
    @GeoffryGifari Год назад +1

    Is there a general rule on what type of physical processes can produce an entanglement (not just photons)?

    • @GeoffryGifari
      @GeoffryGifari Год назад +1

      and are there cases where conservation laws/selection rules end up *not* producing an entangled pair?

  • @werneckpaiva
    @werneckpaiva 3 года назад +3

    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.

  • @NeedsEvidence
    @NeedsEvidence 7 лет назад +1

    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.

  • @doc2590
    @doc2590 2 года назад +2

    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.

  • @skit555
    @skit555 3 года назад

    Completely underrated channel

  • @glutinousmaximus
    @glutinousmaximus 7 лет назад +5

    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.

  • @robertroberto4749
    @robertroberto4749 Год назад +1

    1:44, I can't imagine that this guy is well paid to work on this simple experiment for probably many years !!??

  • @omsingharjit
    @omsingharjit 7 лет назад

    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 ?????

  • @Elbanjomon
    @Elbanjomon 7 лет назад +1

    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..

  • @salzysisters5799
    @salzysisters5799 4 года назад +1

    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?

    • @Chris-hy6tj
      @Chris-hy6tj 4 года назад

      Salzy Sisters I had exactly the same idea. But i heard that only maximum 2 particles can be entangled, and you cannot entangle 3 or more.

    • @salzysisters5799
      @salzysisters5799 4 года назад

      @@Chris-hy6tj So then splitting one will "untangle" the other?

    • @Chris-hy6tj
      @Chris-hy6tj 4 года назад

      @Salzy Sisters must be, but I have no clue

  • @manaoharsam4211
    @manaoharsam4211 2 года назад

    The gentlemen on board did a fantastic Job of explaining.

  • @Cartoonicus
    @Cartoonicus 2 года назад +1

    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?

  • @topnobby
    @topnobby 6 лет назад +1

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

  • @arijitdas7526
    @arijitdas7526 3 года назад

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

  • @sweetwillyp
    @sweetwillyp 5 лет назад

    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

  • @FriedrichBoettger
    @FriedrichBoettger Год назад

    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.

  • @oneminutefixed5003
    @oneminutefixed5003 8 лет назад +1

    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.

  • @clleo888
    @clleo888 4 года назад +1

    Very nice and clear explanation. Good job.

  • @qualquan
    @qualquan 2 года назад

    very good description of how photonic entanglement is achieved.

  • @JoelRogness
    @JoelRogness 13 дней назад

    I'm still not 100% sure I understand the importance of the two crystal part, but thanks so much for this video. Every other video I watch about entanglement skips over the how to create entangled particles phase

  • @DavidTJames-yq9dr
    @DavidTJames-yq9dr 3 года назад

    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.

  • @stephenbrough8132
    @stephenbrough8132 7 лет назад +15

    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.

    • @yoyomamad
      @yoyomamad 7 лет назад +1

      STEPHEN BROUGH well said.

    • @austiblazeit9081
      @austiblazeit9081 7 лет назад +4

      STEPHEN BROUGH lol you deserve a comment of the year award

    • @techwanderer7127
      @techwanderer7127 6 лет назад +1

      This comment had me laughing throughout.

    • @kulyog6626
      @kulyog6626 6 лет назад +1

      I liked your comment but you shouldn't waste energy here.

  • @inboxme5268
    @inboxme5268 6 лет назад +2

    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.

  • @Romeoofbrasil
    @Romeoofbrasil Год назад +1

    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)

  • @loupax
    @loupax 4 года назад +1

    I love your energy and excitement 😄

  • @dmo3074
    @dmo3074 5 месяцев назад

    This was amazing! I would've loved to have seen visual results from the laser experiment, even if they were simple/unattractive plots showing proof of horizontal vs. vertical photon measurements, just as long as it showed proof of entanglement :)

  • @idegteke
    @idegteke 2 года назад

    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.

  • @ChangoBongo999
    @ChangoBongo999 2 года назад

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

  • @tylerblok9903
    @tylerblok9903 4 года назад +5

    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!

  • @Ashley-tl9sr
    @Ashley-tl9sr 9 лет назад

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

  • @MrYouToons
    @MrYouToons 7 лет назад +1

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

  • @clintkennedy8374
    @clintkennedy8374 5 лет назад +2

    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

  • @ragnarlothbrok3691
    @ragnarlothbrok3691 5 лет назад

    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?

  • @BlazPecnikCreations
    @BlazPecnikCreations 7 лет назад +2

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

  • @mason.elmore
    @mason.elmore 7 лет назад

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

  • @edgeeffect
    @edgeeffect 6 лет назад

    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. :)

  • @Sagivbh
    @Sagivbh 4 года назад +1

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

  • @richardmasters8424
    @richardmasters8424 5 лет назад +1

    ...so the universe ‘knows’ which quanta will be observed and responds to entanglement appropriately?

  • @alentech6091
    @alentech6091 8 лет назад +2

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

  • @heatherrayannpiper773
    @heatherrayannpiper773 5 лет назад +1

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

  • @evenaicantfigurethisout
    @evenaicantfigurethisout 5 лет назад

    4:08. if you rotated both the crystal *and* the polarization by the same angle in the same direction, doesn't that just mean that you haven't really done anything at all? i mean they're still in the same orientation with respect to each other. what was the point of doing crystal 2?

  • @scarletevans4474
    @scarletevans4474 Месяц назад

    2:25 why 800nm gives us two 400nm photons? Why not 200nm + 600nm? Or 0.1nm + 799.9nm? Or some other combination?
    After all, it's simply w=w_1+w_2, right? Are there some other, hidden constrains that were not mentioned, but omitted here?

  • @wailingwarlie
    @wailingwarlie 8 лет назад

    Finally know what entanglement is; Mind. Blown.

  • @Bormanb23
    @Bormanb23 4 года назад +2

    I always wondered how so thanks so much

  • @eternaldoorman5228
    @eternaldoorman5228 13 дней назад

    4:24 That bit is clear as mud! This double crystal is producing a pair of pairs of photons now, or what?

  • @anthonycollins5671
    @anthonycollins5671 3 года назад +5

    on behalf of us mere mortals can you explain it by showing the experiment rather than writing maths , thank you

    • @MichaelPiercePhilosophy
      @MichaelPiercePhilosophy 6 месяцев назад +1

      If I had a hat I would tip it to you, sir. Your comment summarizes so much of what bothers me with physics these days.

  • @sciwhat
    @sciwhat 3 года назад +2

    finally, I always confused how 2 particles become entangled to each other. I probably have watched 20-30 videos about quantum mechanic but all of them didn't explain it.

  • @mobinahmed3333
    @mobinahmed3333 9 месяцев назад

    Fresh batch of entangled photons coming right up!

  • @ameyapatil1139
    @ameyapatil1139 4 года назад

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

  • @ChunderThunder1
    @ChunderThunder1 10 лет назад +6

    Great video as always! :D

    • @DrBenMiles
      @DrBenMiles  10 лет назад

      Thanks Disgruntled Goat! :D

    • @lumotroph
      @lumotroph 9 лет назад

      whentheappledrops it's true. Your taste is excellent

  • @ExiledGypsy
    @ExiledGypsy 9 лет назад +6

    I am not a physicist so, first of all I like to apologise if I my question is stupid. I just want to know where I am going wrong here.
    But if I have understood anything about the entanglement principle; it is that two entangled particles have opposite characteristics that is kept regardless of distance: e.g. if one of them is detected to have a right spin then other is bound to have a left spin. My question is does that holds only when they are detected at the same time, the synchronicity of which must be quite difficult to achieve? Given such small tolerances how can we be sure if both measurements are synchronous?
    None the less if that is verified to be correct then I don't see it being that spooky. All we are saying is that when a wave particle is split into two wave particles they remain in sync although mirrored through time (be it a short time). I.e. they are not really communicating with one another through some as yet unknown dimension beyond time and space.
    But if the measurement (detection) doesn't have to be at the same time then it is really spooky because it implies that detecting one part fixes the other part is a definite state which again if I have understood it correctly is contrary to the superposition principle which claims that the state of a particle can not be determined until it is detected.
    If we can know the state of a qbit before it can is detected then all sorts of things should become possible or at least theoretically, such as instantaneous communication because then we can select the qbits based on their known states.

    • @SuperGipsySwing
      @SuperGipsySwing 7 лет назад +14

      The thing is that physicists have made an experiment that is accurate enough to say that during the measurement made on two spatially separated photons, not even light could have travel (and potentially carry information) between those two photons during the measurements. So of course, physicists can not pretend the measurements are absolutely synchronized (and it doesn't even make sense to say so because if you change your frame of reference, the synchronization will change, cf special relativity), but they could state for sure that there was no information coming at speed of light exchanged by one measured photon to another.
      The reason why it is spooky is the following : none of the photon have an identity before ones make one measurement. It is not as if you had two balls, one red, one blue, you hide the color and put one ball on another planet. After that, you check the color of your ball : say it is red, so you know with certainty that the other ball on the other planet is blue. This is classical physics, and their was no information exchanged between the two balls because the balls already had colour before you separate them. The quantum mechanical version of this experiment is : the two balls are in superposition of state and entangled, so it is as if they are both blue and red. No matter how you separate them. If you try to determine what is the colour of one ball is (say red), the other is instantaneously blue, and this is true no matter of how far the balls are. The ball you didn't measure is now blue with certainty. How does the ball knows it is blue now? No one answered this question correctly yet. The only subtlety is that we can not realise with real balls because they are macroscopic object and the uncertainty principle would not allow us to produce obvious entangled state. This is why we use photons and polarisation, otherwise the principle is the same.
      What you say at the end is right, this is why so much people are working on qbits and quantum computer. But you should not forget that in order to be entangled, the photons should have interact in the past.
      I'm not used to speak english and the topic is tough so I hope it is understandable :)

    • @awkweird_panda
      @awkweird_panda 7 лет назад

      Clément De Daniloff my mind just got blown. Thanks for that explanation tho.

    • @anii7y
      @anii7y 7 лет назад

      Seems like you understand your quantum physics, would you help me with my questions?
      1.Does this mean that after measurements are taken on the first particle, the second particle is no longer in superposition?
      2.Can multiple measurements of the same particle be taken throughout a period of time? Would the particle change its position every time?

    • @AbhishekNigam
      @AbhishekNigam 7 лет назад

      Babak Kamali Mind = blown

    • @SuperGipsySwing
      @SuperGipsySwing 7 лет назад +2

      Antoniq Nencheva Hi again. I can at least try to answer your question.
      first question : yes exactly. I will take again the example I wrote above with colored ball. So let us suppose that, like polarization of photons, I can produce two entangled ball whose colour can take two value : blue or red. The state is such that the ball always the same colour a measurement. In the Dirac formalism this is written like :
      state = | Blue, Blue > + | Red, Red>
      which is a superposition of the state where the two balls are Blue, and one where the two balls are red. Say I measure one the colour of one of the two balls. Say I obtain "Blue". The wavefunction is said to "collapse" and the state of the system direct after the measurement is | Blue, Blue>
      At this point, the following statements are true :
      - The two balls are no longer entangled. Every new measurements made on one of the two balls will never affects the other one. This will remain true as long a the two balls don't interact again, and in order to interact again they have to be in the same place and meet a device that produces entanglement.
      - the system composed of two balls is no longer in a superposition of states : | Blue, Blue >
      - the system composed of only one ball is no longer in a superposition of states : each ball is in the state | Blue>.
      - If I keep measuring the colour of one ball or another or both, I will always obtain "Blue"
      Note : I will not be able to explain why when where and how the wavefunction collapse during measurement, neither I can explain correctly what we mean by measurement. If someone do know. The interpretation of Quantum mechanics is a big subject of debate.
      I hope this answer your question! There are some other subtleties that I did notre mention here but If you want I can give you the link to a video where everything is explained in detail (it explains how measurement changes the state of the system, and what are the consequence for entangled system)

  • @unterwegsimwesennamensmatthias
    @unterwegsimwesennamensmatthias 2 года назад

    Thank you for this great explanation.

  • @buckrogers5331
    @buckrogers5331 6 лет назад

    So, introducing uncertainty (@4:23) is entanglement? I thought a demonstration of entanglement would be to do something on a separated photon to see the same effects on the other? My guess is by using two crystals back to back, you are not measuring the output of one (thus affecting its state) but to let the natural medium of the second crystal to do its job. The question would be: then how many photons are split and which are entangled? Somehow I feel the explanation in the video is kind of lost after introducing two crystals!

    • @strangerwithscience3597
      @strangerwithscience3597 4 года назад

      Not many are split and the ones with lower energy are the entangled ones

  • @dereksawle
    @dereksawle Год назад

    So very well explained - thank you!

  • @detscadosu2465
    @detscadosu2465 7 лет назад +1

    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?

  • @jaapongeveer6203
    @jaapongeveer6203 26 дней назад

    So, how is that different from Ann and Bob, blind folded, reach into a box with a pair of gloves and each takes one, gets on a bus to either end of town. Once off the bus Ann looks and sees she has the left handed glove and knows right away that Bob has the right hand one? Entanglement for me would be if the left handed glove could be made right handed forcing the other to become left handed.

  • @tycho_m
    @tycho_m 10 лет назад +1

    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?

    • @DrBenMiles
      @DrBenMiles  10 лет назад

      Thanks Melle Beemster! That's a major compliment! (that I don't think I'm quite worthy of yet but I'll keep working on it!)
      Up until recently, it has been very, very hard to control, which is why this working set-up is receiving so much attention at the moment. Seems we are now starting to get our head around how to practically achieve photon base computation!
      The trapped light experiment looks really interesting! Hadn't taken the chance to read up on it before now, so cheers!

  • @mahmoudnafousi2427
    @mahmoudnafousi2427 6 лет назад

    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

  • @OwenWithAHammer
    @OwenWithAHammer 10 лет назад +1

    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?

    • @DrBenMiles
      @DrBenMiles  10 лет назад +1

      Thanks OwenWithAHammer! Yes! Canada is one of my favorite countries. I did a year of undergrad Uni at McGill and loved it. I'm hoping to make it up during the summer, super cool country and excellent people.

  • @masterineverything
    @masterineverything 10 лет назад +1

    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

    • @DrBenMiles
      @DrBenMiles  10 лет назад

      Thanks man, good tip, will try it next time.

  • @GA-kx8yh
    @GA-kx8yh 5 лет назад +4

    I'm confused how the crystal (sometimes) splits the photons into two

    • @Clone42
      @Clone42 5 лет назад +6

      Photons are not matter, their behavior can only be express in wave functions, in so much as photons are a "they." Think of reality as the surface of a lake. This "surface" even exists in the "vacuum" of space in what is called the "gluon field." Photons are not a molecule, but distortions on the surface of the water. Everything from red light to blue light to wi-fi are the same "thing," the only difference is the wave-length (frequency). As the wave ripples out and encounters an obstacle it splits into two. Unlike waves in a lake, quantum effects have inherent uncertainty thanks to super-positions, so behavior can't be reliably predicted. You can only predict the probability that something *might* happen. At the quantum level things are blinking from position to position like raindrops falling on the lake rippling out tiny waves. The fundamental nature of reality is so completely unintuitive that metaphors are almost useless, which is why this stuff is so hard to grasp. It makes no sense because it violates our sense of what is possible due to our minds being wired around how things behave at larger scales. That's my layman's understanding.

    • @strangerwithscience3597
      @strangerwithscience3597 4 года назад

      @@Clone42 did u just say photon can only be thought of as waves?? Sorry but a guy named Einstein has a nobel prize saying otherwise...

    • @strangerwithscience3597
      @strangerwithscience3597 4 года назад +1

      The photon is absorbed by an electron. The electeon goes into a higher energy state and as it decays back down to its neutral state it produces photons. Sometimes it makes 2 red/infrared photons instead of one blue photon.

    • @paulstandaert5709
      @paulstandaert5709 4 года назад

      What I got out of it is this:
      Have you ever played with polarized eyeglass lenses? When you look at an LCD display with polarized lenses, you can tilt your head and make the display go blank. Also, when wearing them, you can see into water much better which can be obscured by reflections on the water surface, which the polarized lens cancels allowing you to see below the water surface. Tilt your head, and the polarization doesn't do it's job anymore and you can't see past the reflections on the surface of the body of water.
      Also, if you remove the lenses, you can look through them both simultaneously and see quite well. If you rotate one of the two lenses 90 degrees, no light makes it through.
      The lcd display I mentioned before emits polarized light, which will pass right through a polarized lens if the polarization filter axis matches up, and you see the LCD display. Turn the glasses 90 degrees (tilt your head) and the display will black itself out.
      The reflections of light on the water surface are, I believe, horizontal wave photons. Filter them with the polarized lens, and you don't see them anymore. They get blocked. Somehow they shoot a laser beam with photons with both a vertical and horizontal waves through two crystals (same concept as a liquid crystal???) oriented properly like the lenses mentioned above and what makes it through are two photons, split from the original somehow with the same characteristics.

  • @mambosenkoatruaywnn1429
    @mambosenkoatruaywnn1429 Год назад +1

    You do not create entanglement , no one can create entanglement ,,,, but entanglement exists through the Divine standard natural program , all that needs to be done is to create the necessary equipment that frequently resonates with entanglement ...

  • @kapoorh
    @kapoorh Год назад

    But how do they produce entanglement at very large distances such as what was done in Bell experiment to measure communication between two photons at a distance where communication has to take place at faster than the speed of light.

  • @armh
    @armh 10 лет назад +1

    Jacques is amazing. Great videos btw

    • @DrBenMiles
      @DrBenMiles  10 лет назад

      ShawarmaLifeLiving He is indeed! And thanks!

  • @junak777
    @junak777 2 года назад

    381 th coMMent
    You and Peja STojakovic are quantum entangled. :-))
    All the best.
    Nice video.

  • @BrianPeiris
    @BrianPeiris 10 лет назад +3

    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?

    • @DrBenMiles
      @DrBenMiles  10 лет назад +1

      Brian Peiris Hey! Good question. Unfortunately most optics set ups are quite expensive as the components need to be high quality and aberration free. Also the laser used in this set up produces a pretty powerful femtosecond pulse and runs above £100k :/ as it is a bit of a niche market.
      In principle though, yes! It's not too complicated to produce entanglement, the tricky part is keeping them entangled and unaffected by the environment (unobserved). And then doing something useful with them!

    • @JB_inks
      @JB_inks 10 лет назад +2

      whentheappledrops it's not helpful using expressed such as "observed", perhaps you should say measured. You cannot measure without disturbing/interfering. Saying "observed" implies it is a passive process and conjurs up anthropomorphic images, which leads to woo

    • @DrBenMiles
      @DrBenMiles  10 лет назад

      joyork Cool man. I feel where you are coming from

    • @brandoniglesias5570
      @brandoniglesias5570 8 лет назад

      does the table or room have to be near "vibration free" like an SEM table or room?

    • @paulkocyla1343
      @paulkocyla1343 6 лет назад

      You can buy BBO crystals for 1000$ and a simple UV laser will do. You´ll need polarization filters and phaseshifters as well, but you can do it for like 2000$ total. To check your entangled photons, you´ll need the so called coincidence counter consisting of two avalanche photon counters.
      I heard it can be set up for 5000$.

  • @sanjuansteve
    @sanjuansteve 7 лет назад

    Can someone suggest a good link to explain how a single photon can have a wavelength, how a single particle oscillates or orbits or otherwise behaves as a wave? Thx

  • @sebastianeapen9210
    @sebastianeapen9210 5 лет назад +1

    My experience in life explained scientifically. Appreciate

  • @cj03harr
    @cj03harr 6 месяцев назад

    How does someone set this up? Can you make a video on that? I want to know what to buy

  • @markkatz7124
    @markkatz7124 2 года назад

    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 ?

  • @dylanalbiston
    @dylanalbiston 9 лет назад

    keep the good work up. we love you!

  • @ToddDesiato
    @ToddDesiato 5 лет назад

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