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

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Discussion Overview

The discussion revolves around the concept of quantum entanglement, exploring its definition, implications for space-time and matter, and the underlying reasons for its occurrence. Participants express varying levels of understanding and seek clarification on both theoretical and practical aspects of the topic.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • Some participants inquire about the definition of quantum entanglement and its effects on space-time and matter.
  • Several replies emphasize that quantum entanglement is an advanced topic, suggesting a background in quantum mechanics is beneficial for understanding.
  • One participant mentions that quantum entanglement is a measured correlation of properties between two objects, regardless of distance.
  • Another participant states that the reasons for the occurrence of entanglement are not fully understood and are still being studied.
  • A participant introduces the principle of superposition as a basis for understanding entanglement, providing a mathematical representation of entangled states.
  • There are references to specific concepts such as SPDC (Spontaneous Parametric Down-Conversion) and the EPR (Einstein-Podolsky-Rosen) paradox as examples related to entanglement.
  • Some participants express uncertainty about the relationship between entanglement and space-time, with one stating that entanglement has no classical analogue and is not directly related to space-time.
  • Recommendations for further reading and resources, including books and videos, are provided by participants to aid understanding.

Areas of Agreement / Disagreement

Participants generally agree that quantum entanglement is a complex and advanced topic, but there is no consensus on the reasons for its existence or its implications for space-time. Multiple competing views and interpretations remain present throughout the discussion.

Contextual Notes

Participants express varying levels of background knowledge in physics, which may affect their understanding of the topic. There are references to the need for a solid foundation in classical physics before tackling quantum concepts, and some mathematical steps and assumptions are not fully resolved.

Who May Find This Useful

This discussion may be useful for individuals interested in quantum mechanics, those seeking to understand the implications of quantum entanglement, and readers looking for resources to deepen their knowledge of advanced physics topics.

Dhruv007
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Can anyone explain me ; -

What is quantum entanglement and how it effects the space-time and matter in our universe??
 
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Have you search this forum for previous discussions or Google?
 
Greg Bernhardt said:
Have you search this forum for previous discussions or Google?

Saw a lecture on it on YouTube. But didn’t quite understand it.
 
Greg Bernhardt said:
Check out the wikipage
https://en.wikipedia.org/wiki/Quantum_entanglement

In general it's an advanced topic, so you should have taken a Quantum Mechanics course before venturing into it.

I haven’t taken any courses on physics. Just read and understand stuff that seems interesting to me. And thanks for the link.
 
Greg Bernhardt said:
Check out the wikipage
https://en.wikipedia.org/wiki/Quantum_entanglement

In general it's an advanced topic, so you should have taken a Quantum Mechanics course before venturing into it.

What i want to know is ;-
Why does it occur and how does it occur.
 
Dhruv007 said:
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.
 
Greg Bernhardt said:
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
 
Dhruv007 said:
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
Greg Bernhardt said:
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,
Dhruv007 said:
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...
Dhruv007 said:
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.
Dhruv007 said:
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.
Dhruv007 said:
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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  • #14
DennisN said:
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
 
Last edited:
  • #16
Dhruv007 said:
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
DennisN said:
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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