Entanglement and time dilation

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Discussion Overview

The discussion centers around the relationship between quantum entanglement and the concept of simultaneity in the context of special relativity, particularly focusing on how time dilation affects the measurement of entangled particles. Participants explore the implications of these concepts for understanding predictions about the states of entangled particles.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions how simultaneity is defined in the context of entangled electrons, suggesting that time dilation could imply that measurements are not simultaneous across different reference frames.
  • Another participant clarifies that entanglement does not require simultaneous measurements, emphasizing that the order of measurements does not affect the correlation between the results.
  • A further comment references the EPR paper, suggesting that the ability to predict the state of one particle based on the measurement of another was a significant point in the original discussion of entanglement.

Areas of Agreement / Disagreement

Participants express differing views on the implications of simultaneity and time dilation in the context of entanglement, indicating that multiple competing perspectives remain unresolved.

Contextual Notes

The discussion does not resolve the assumptions regarding the definitions of simultaneity and the implications of time dilation on entangled measurements.

goran d
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In entanglement, two electrons have the same spins measured at the same time. But how is same time defined, in light of special relativity's time dilation?
Doesn't this mean that, from another frame of reference, they will not be simultaneous. That means, that person in point A, knows in advance, what will be the spin in the future point B. Isn't this prediction of the future?

In which reference frame is the measurement simultaneous?
 
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goran d said:
In entanglement, two electrons have the same spins measured at the same time. But how is same time defined, in light of special relativity's time dilation?
That's not quite right. Entanglement means that if we measure the spin of one electron, we will know what would result from a spin measurement of the other electron, if and when such a measurement is performed.

There is no requirement that the two measurements be simultaneous, and indeed it is irrelevant which one is done first. We do the measurements in either order and when we're done we compare them and find the correlation.
 
goran d said:
... That means, that person in point A, knows in advance, what will be the spin in the future point B. Isn't this prediction of the future?

That such could occur was actually a key premise of the 1935 EPR paper. See their discussion of "element of reality". If you want to see the paper, check out 1. from the following:

http://www.drchinese.com/David/EPR_Bell_Aspect.htm
 
thank you for your answers
 

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