Quantum Computing - Spooky Action at a Distance - Part 4 - Extra History

💻 Quantum Computing: Spooky Action at a Distance - What happens when we can't link physical cause and effect between two actions? Well, quantum bits (or qubits) do this all the time. Let's look into how quantum entanglement can be used in computing.

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[extrahistory]

"Spooky action at a distance" -- a strange phenomena where, in certain sets of particles, when you do something to one of them, the rest are instantly effected. It’s what we today know as Quantum Entanglement, and it’ll be at the heart of how a quantum computer functions.

[Mathmachine]

I think the puns at the end were the spookiest part of the video.

[rjr]

The explanation of entanglement is wrong. If it worked in a way that allowed a change in the spin in one particle to affect the spin of the other, it could be used to transmit messages like Einstein feared.

Entanglement deals with measurements. If the pair has zero spin and we measure one particle to have +1 spin, the other particle must have -1 spin. No information is transmitted because the other particle's spin can be inferred from the information the first person has (A=1, A+B=0). The spooky quantum part is that the underlying spins are undetermined before measurement. If we measure spin vertically, one will be up and the other will be down. If we measure spin horizontally, one will be right and the other will be left.

[anttibjorklund]

You did that beginning just because Hallowe'en is coming up, right? XD

[tomrivlin]

Yeah as some people have pointed out this is a good video but I feel a small correction is needed: no FTL communication is possible with entanglement because it's impossible to transmit information using the process described above. The explanation for why this is the case is very tricky and subtle but suffice to say no serious research is ongoing into using this phenomenon for FTL communication, as cool a sci-fi concept as that would be.

[abledbody]

Things explained: How crazy the thing they're about to explain is.

Fundamentally important concepts completely glossed over: Entirely too many.

[konstantinkh]

That is absolutely NOT how entanglement works. No-communication theorem specifically prevents you from altering the state of remote particle in the way described. Not to mention that it's just missing the point. If the sum of two spins is zero, what's crucial is measuring one, tells you the state of the other, while prior to measurement BOTH particle have undetermined spin individually. _Measurement_ of one puts the other in a determined state. Other manipulations have no effect on remote particles. And no, nobody is trying to use entanglement for communication, except for same people who try to use magnets for infinite energy source. The mathematical impossibility of this feat is built into the theory.

[EyalBrown]

Phenomenon. When talking about just one, it's phenomenon. Phenomena is plural.

[PK]

There's a lot of very inaccurate information about entanglement in this episode, especially the bit about "experimenting with transmitting information faster than light". This is impossible- check out the "no-communication theorem"

[josephgroves]

Extra Credits good for trying new subjects, but research better. Your physics is no longer just simplified, it's bordering on misleading and in a couple of places just plain wrong.
Please adjust course

[xgozulx]

THIS IS WRONG information travels at the speed of light, period. that's not how the entanglement works.

[TheAgamemnon]

No. That is precisely how spooky action at a distance doesn't work. You still cannot transmit information that way, because to make sense of the measurements that you took at each end, you still have to transmit the parameters you chose to the other party. Omitting this important detail makes the explanation wrong.

[ulisespastordiaz]

Really cool video, nice job trying to explain such a difficult subject in a condensed way.

Just a clarification for a question people is wondering about. In the experiment of quantum teleportation (let's say between Alice and Bob), Alice needs to send classical information for Bob to infer which qubit was Alice trying to send before she measured, so in theory there can not be faster than light communication between them.

[danielbak]

You should redact this entire video, your explanation of quantum entanglement is completely off base

[stephenturnbull]

Have to agree the entanglement description is ... Incorrect.

If you touch or edit one atom in a pair of entangled particles the system us use to edit the atom becomes entangled. The entanglement is movable. In a process called de-cohearance. The other atom's properties do not change in this process.

[state_song_xprt]

Wait are you just going to skip the debate over the Copenhagen Interpretation? And the whole mess finally being proven to be a mess by Bell's Theorem and the torpedoing of local realism?
BTW for people who want to know more, the channel 3Blue1Brown has a great if mindblowing video on Bell's Theorem.

[calvinscarvings.]

Quantum computing is pretty much us redstone engineers realizing observers (before they were nerfed) transmit signals instantly leading to super fast redstone

[jojoh]

you can't use this to transmit data

[keithwinget]

Please revisit this in a new episode with better-researched information, or provide links to your sources, because as far as I and many others can tell, you certainly failed to research this properly. If your are going to attempt to put out educational content like this, don't destroy your credibility with bad information. I'm asking this cordially as a fan. I would like to be able to reliably quote you to my friends to feel superior, and I can't if you get your stuff wrong. :P

[Pebble_Hill]

"Knew I count *count* on you."
Ha ha, puns are fun
"It won't hap *pun* ... again."
Okay, bring back Dan now.