What is quantum entanglement and how it effects the space-time

Basically, if you can do the calculations in one step you can do them in the other.So basically, we have no idea about why entanglement exists, so we call it a property of our universe.f
  • #1
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Can anyone explain me ; -

What is quantum entanglement and how it effects the space-time and matter in our universe??
 
  • #3
Have you search this forum for previous discussions or Google?

Saw a lecture on it on YouTube. But didn’t quite understand it.
 
  • #7
What i want to know is ;-
Why does it occur and how does it occur.
Right, but like I said, this is a very advanced topic and if you don't have any physics background it will not be possible to understand. Start with mastering classical physics first.
 
  • #8
Right, but like I said, this is a very advanced topic and if you don't have any physics background it will not be possible to understand. Start with mastering classical physics first.

Dont worry. I have a stong background
 
  • #9
Dont worry. I have a stong background
So after reading the wiki page, what are your specific questions? The page does touch on "Why does it occur and how does it occur."
 
  • #11
So after reading the wiki page, what are your specific questions? The page does touch on "Why does it occur and how does it occur."

I understand the definition. But i want the details about how it occurs. The why can be left.
 
  • #13
Hi Dhruv007,
I haven’t taken any courses on physics. Just read and understand stuff that seems interesting to me.
Then it could be a little tricky, but I'll give it a try...
What is quantum entanglement
Quick and dirty: A measured correlation of the properties of two objects, regardless of e.g. the distance between the objects.
and how it effects the space-time and matter in our universe??
This is not entirely clear at the moment, it is being thought of and studied.
Why does it occur and how does it occur.
Why? Because that is a feature of our Universe. :smile:
How? See e.g. SPDC (which is an example)

You can watch this clip, where the quantum physicist Anton Zeilinger describes entanglement (at 1:30 into the clip and onwards) and a variety of experiments/applications:
Anton Zeilinger - Quantum Information and Entanglement


You can also have a look at EPR paradox.
 
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Likes BCHC and Greg Bernhardt
  • #14
Hi Dhruv007,

Then it could be a little tricky, but I'll give it a try...

Quick and dirty: A measured correlation of the properties of two objects, regardless of e.g. the distance between the objects.

I get the definition thanx.

This is not entirely clear at the moment, it is being thought of and studied.

I thought so.

Why? Because that is a feature of our Universe. :smile:

So basically, we have no idea about why entanglement exists, so we call it a property of our universe.

How? See e.g. SPDC (which is an example)

SPDC was quite simple to understand. Thanks fot recommending it.

You can watch this clip, where the quantum physicist Anton Zeilinger describes entanglement (at 1:30 into the clip and onwards) and a variety of experiments/applications:
Anton Zeilinger - Quantum Information and Entanglement


You can also have a look at EPR paradox.


And i have already read the EPR paradox.
 
  • #15
Quantum entanglement is a simple consequence of the principle of superposition. It says if a system can be in state |a> or in state |b> then it can also be in state c1*|a> + c2*|b> where c1 and c2 are complex numbers. For definiteness in what follows I will take them as 1/√2.

Now take two systems, system 1 and 2, which can be in state |a> or state |b>. If system 1 is in state |a> and system 2 in state |b> that is written as state |a>|b> and conversely if system 1 is state |b> and system 2 in state |a> that is written as state |b>|a> . Now let's apply the principle of superposition to this combined system so a possible state is 1/√2|a>|b> + 1/√2|b>|a>. In fact some think it is the basis of QM but that is another story - start a separate thread if you want to go it it - its associated with Hardy's axioms:
https://arxiv.org/pdf/quant-ph/0101012.pdf

It turns out the continuity assumption is logically equivalent to entanglement:
https://arxiv.org/abs/0911.0695

The systems are said to be entangled - it is a peculiar state of affairs with no classical analogue. It has no relation to space-time. It's relation to matter and how we perceive it lies in something called de-coherence - but it can't be explained simply. You should really study it:
http://philsci-archive.pitt.edu/5439/1/Decoherence_Essay_arXiv_version.pdf
https://www.amazon.com/dp/3540357734/?tag=pfamazon01-20

Thanks
Bill
 
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  • #16
So basically, we have no idea about why entanglement exists, so we call it a property of our universe. . (my bolding)
Yeah, but the same goes for every other physics concept; we have no idea why [insert any physics concept here] exists, it is a feature of our Universe.

I further recommend Richard Feynman who in this video elegantly describes the problems with "why questions": :smile:
 
  • #17
Yeah, but the same goes for every other physics concept; we have no idea why [insert any physics concept here] exists, it is a feature of our Universe.

I further recommend Richard Feynman who in this video elegantly describes the problems with "why questions": :smile:


Thanx. Video was quite helpful
 

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