Is entanglement a fundamental resource for quantum information processing?

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Discussion Overview

The discussion revolves around the nature of entanglement in quantum information processing, exploring its relationship with concepts such as entropy, superposition, nonlocality, and decoherence. Participants question the implications of entanglement in various contexts, including its connection to cosmology and black holes, as well as its preservation and measurement challenges.

Discussion Character

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

Main Points Raised

  • Some participants inquire whether an Alice-Bob scenario involves entropy and how it relates to the determination of correct states.
  • There is a question about the connection between superposition, nonlocality, and measurement, with some suggesting it may be trivial or not worth answering.
  • Participants express uncertainty regarding the relationship between entanglement and cosmology, with one participant explicitly stating they do not know the answer.
  • One participant posits that entanglement is a universal phenomenon but questions whether it only occurs locally.
  • Another participant argues that entanglement cannot be easily preserved due to rapid loss of coherence, introducing the concept of "entanglement sudden death."
  • There is a discussion about the nature of entanglement as a correlation and its relationship with decoherence, questioning whether superposition and entanglement are distinct or interdependent.
  • Participants explore the idea of quantum information entropy and its potential differences from classical entropy, raising questions about the fundamental nature of these concepts.

Areas of Agreement / Disagreement

Participants express various viewpoints and uncertainties regarding the nature of entanglement, its implications, and its preservation. No consensus is reached on the questions posed, and multiple competing views remain throughout the discussion.

Contextual Notes

Some discussions hinge on the definitions of terms like entropy and coherence, and the implications of decoherence are not fully resolved. The relationship between classical and quantum information remains an area of exploration without definitive conclusions.

sirchasm
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Does an Alics-Bob scenario include entropy, and does it increase if they both determine correct states?

What if they don't? Is knowing an entanglement exists an expectation? Is measuring it a probability?

So if there's expectation and probability (or maybe there isn't). is there information (with entropy)?
??(Hope this isn't too much for the mods here)
 
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What is the connection between superposition, nonlocality and measurement?

No-one knows, or it isn't worth trying to answer - it's too trivial a question.

Why is entanglement unrelated to cosmology? Does anyone know? (I sure don't)
 
sirchasm said:
Why is entanglement unrelated to cosmology? Does anyone know? (I sure don't)

Entanglement is a quantum mechanical phenomenon and, as such, this post is better suited to the Quantum Physics forum. Hence, it was moved.
 
Entanglement is also a universal phenomenon. Can we assume that it only 'happens' if we do it (locally)?

What connection is there between entanglement and black holes or the information horizon?
 
sirchasm said:
Entanglement is also a universal phenomenon. Can we assume that it only 'happens' if we do it (locally)?

This really has no meaning. Even if entanglement is a "universal phenomenon", it cannot be easily preserved! One loses coherence VERY quickly, even with just ONE interaction[1]! In fact, it has been shown the the loss of coherence is faster than the typical statistical decay[2]. It occurs very fast that it's been called an entanglement sudden death!

Zz.

[1] https://www.physicsforums.com/showpost.php?p=1498616&postcount=55
[2] Ting Yu and J.H. Eberly, Science v.323 p.598 (2009).
 
Entanglement is a correlation; it gets 'decohered' by the environment, or measurement (these are equivalent 'decoherence' operators, at some scale).

What's the relationship between superposition and entanglement? Are they distinct or does one depend on the other?
Is entanglement just a "static" (time-independent) correlation? A sort of 'bit' stored in a memory, whereas 'dynamic' correlations are the equivalent of reading a bit from memory and processing it?

Decoherence is then just 'noise', in the channel, as it were? We need to use ECC in classical communication, we use QECC in quantum communication - this is (to me) an obvious kind of model.

The "problem" is how we get information into the classical domain - obviously it's already there in CC.

Hence the entropy angle, what is quantum information entropy, is it fundamentally different to classical entropy, or is there (apart from the disconnect between classical/quantum) no real difference. (Why should there be?)
 

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