Simultaneous measurement of entanglement

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    Entanglement Measurement
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Discussion Overview

The discussion revolves around the implications of simultaneously measuring the same parameter on two entangled particles, specifically in the context of quantum mechanics. Participants explore the nature of entanglement and the outcomes of such measurements, including potential contradictions arising from the use of filters.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the implications of simultaneous measurements on entangled particles and seeks clarification on the topic.
  • Another participant suggests that the predictions of quantum mechanics will be verified through such measurements.
  • A participant provides a specific example involving entangled spins, stating that measurements will always yield opposite results regardless of the measurement conditions.
  • One participant expresses a desire to explore the concept of exclusivity in measurements, suggesting that using filters could lead to contradictions.
  • Another participant requests clarification on the original question and the nature of the responses, indicating confusion about the discussion's direction.
  • There is mention of external resources, such as an arXiv paper, which may provide additional context or information.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as there are multiple interpretations of the implications of simultaneous measurements and the role of filters, leading to confusion and requests for clarification.

Contextual Notes

Some participants express uncertainty about the specifics of the original question and the responses provided, indicating that assumptions about the nature of measurements and filters may not be fully articulated.

QuestionMarks
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Im not sure if there are any implications to be made, but it struck me as interesting as what would happen if measurements of the same parameter were simultaneously made on each of two entangled particles? Can anyone speak to this perchance?
 
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Do you mean simultaneous measurement of, for example, polarisation of both photons? QM results will show, is my answer.
 
Yes but I don't understand what you mean by your answer.
 
The predictions of Quantum Mechanics will be verified.
 
If you have an entangled state with spin total spin S = 0 and individual spins s = +1, -1

##|S=0\rangle = |+\rangle\otimes|-\rangle + |-\rangle\otimes|+\rangle##

then measurements of spin on particle 1 (the first ket) and on particle 2 (the second ket) will always result in opposite directions of spin [regardless of the axis defining the spin of the kets and regardless of the axis used in the experiment]. This result does neither depend on the locations nor the times where and when the two experiments for particle 1 and 2 are performed.
 
I would expect this inititally, but I should have elaborated that I was trying to get a question of exclusivity: for instance, as such of using a filter. It would, in my mind, nigh force a contradiction.
 
I don't get your point
 
Your question and responses are very unclear.

Is there anyway you can elaborate further on what exactly your question is, and what responses you'd like?

I'm more than happy to answer to the best of my knowledge if I can comprehend your question.

Filters? Do you mean polarisers? Wave plates? After a system (e.g. electron or photon) is detected by an apparatus, there isn't much filtering of the system that can be done. Only prior.
 
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