Change (control)the spin up or down of 1 entangled particle

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Discussion Overview

The discussion revolves around the possibility of controlling the spin of an entangled particle to transmit information instantaneously across distances, exploring the implications of quantum entanglement in communication.

Discussion Character

  • Debate/contested
  • Exploratory
  • Technical explanation

Main Points Raised

  • Some participants propose that while it is possible to change the spin of an entangled particle, this does not allow for faster-than-light (FTL) communication, as the recipient would only observe random noise without classical communication methods.
  • Others argue that entangled particles have applications in quantum information theory, including superdense coding and quantum state teleportation, but these do not enable FTL communication.
  • One participant questions the reasoning behind the assertion that the recipient sees random noise and seeks clarification on the concept of timing and pre-agreed protocols for communication.
  • Another participant emphasizes that the topic has been discussed extensively in the forum and suggests searching for previous discussions for more information.

Areas of Agreement / Disagreement

Participants generally agree that FTL communication via quantum entanglement is not possible, but there are differing views on the implications and applications of entanglement in communication.

Contextual Notes

Some limitations include the dependence on classical communication methods for transmitting information and the unresolved nature of how entangled states can be utilized without violating causality.

lnsanity
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I want to know if its possible to change (control)the spin up or down of 1 entangled particle so it would be possible to transmit data throughout the universe instantly.
 
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lnsanity said:
I want to know if its possible to change (control)the spin up or down of 1 entangled particle so it would be possible to transmit data throughout the universe instantly.

It is impossible to transmit Information FTL (Faster Than Light) using quantum Entanglment. It is poossible to change the spin, but for the recipient on the other end (call him Bob for formality) would only be able to see random noise. You need non-quantum (Classical) means of communication. You could meet before you part and agree on certain timings, etc... but then you've ALREADY communicated the information sub-c right? When you break down all of the other ideas you run into the same issue; "Spukhafte Fernwirking" certainly seems to exist, but in terms of using it to break the limits sets by Relativity and Causality are out. Sorry!

This doesn't mean Entangled partcles wouldn't be useful as means of communicating information, but you'd be doing it at or below 'c'. You should do some research into quantum computing, crptology, and sub-c secure communications. There ARE amazing properties of what you're talking about, they just happen to not break Causality.
 
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Must consider about entanglement :


Applications of entanglement

Entanglement has many applications in quantum information theory. With the aid of entanglement, otherwise impossible tasks may be achieved. Among the best known applications of entanglement are superdense coding, quantum state teleportation, information exchanges through time, and the creation of a Quantum Computer. Efforts to quantify this resource are often termed entanglement theory.[9] [10] Quantum entanglement also has many different applications in the emerging technologies of quantum computing and quantum cryptography, and has been used to realize quantum teleportation experimentally[11]. At the same time, ... http://en.wikipedia.org/wiki/Quantum_entanglement#Applications_of_entanglement"
 
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Frame Dragger said:
It is impossible to transmit Information FTL (Faster Than Light) using quantum Entanglment. It is poossible to change the spin, but for the recipient on the other end (call him Bob for formality) would only be able to see random noise. You need non-quantum (Classical) means of communication. You could meet before you part and agree on certain timings, etc... but then you've ALREADY communicated the information sub-c right? When you break down all of the other ideas you run into the same issue; "Spukhafte Fernwirking" certainly seems to exist, but in terms of using it to break the limits sets by Relativity and Causality are out. Sorry!

This doesn't mean Entangled partcles wouldn't be useful as means of communicating information, but you'd be doing it at or below 'c'. You should do some research into quantum computing, crptology, and sub-c secure communications. There ARE amazing properties of what you're talking about, they just happen to not break Causality.

Why would the other only see random noise he cannot see the particle changing state ? can you clarify ? What do you mean by timing ? can you clarify that too ? a protocol is always decided in advance before transmitting a message...
 


lnsanity said:
Why would the other only see random noise he cannot see the particle changing state ? can you clarify ? What do you mean by timing ? can you clarify that too ? a protocol is always decided in advance before transmitting a message...

As I said, this is a subject that has been covered, probably dozens of times in this forum. JDo a search, and I guarantee you'll find all the answers you need.
 


Frame Dragger said:
As I said, this is a subject that has been covered, probably dozens of times in this forum. JDo a search, and I guarantee you'll find all the answers you need.

OK thank where it as been covered can you give me a link please ?
 


lnsanity said:
OK thank where it as been covered can you give me a link please ?

https://www.physicsforums.com/search.php?searchid=2042777
 
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