Is predicting the future with Quantum Erasure possible?

Click For Summary

Discussion Overview

The discussion revolves around the possibility of predicting future events using a modified quantum erasure experiment. Participants explore the implications of entangled photons and the concept of coincidence counting in quantum mechanics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant proposes a modified quantum erasure experiment involving a photon with three paths, suggesting that the outcome could predict future events based on the path taken.
  • Another participant counters that the pattern produced by the s-photon remains unchanged regardless of the path taken by the p-photon, emphasizing that interesting patterns arise only in the coincidence counts between detectors.
  • A later reply indicates a lack of understanding regarding the coincidence counting mechanism and expresses a desire for further clarification.

Areas of Agreement / Disagreement

Participants do not reach a consensus, as there are competing views on the implications of the proposed experiment and the nature of the patterns observed in quantum erasure setups.

Contextual Notes

The discussion highlights uncertainties regarding the interpretation of coincidence counts and the mechanics of the proposed experimental setup, which may depend on specific definitions and assumptions in quantum mechanics.

tokyoburns
Messages
2
Reaction score
0
Hi I tried to post this before but it got messed up. hopefully it doesn't post twice. I'm new to this forum and signed up just to ask this question. I have just read this website and it has helped me to understand the basic problems of quantum mechanics. After thinking about the quantum erasure experiment described at the end of the site I thought of my own experiment where it would possible to predict anyone future event of your choosing. I thought I must be wrong but I can't find any information to answer my question so I'm bringing it to you. So here is the experiment...

You modify the erasure experiment so that path of the p photon now has 3 paths instead of one definite one and a switch that can decide the path taken by the photon. The first path is a loop that can hold the photon indefinitely. It could be something like a fiber optic loop or two mirrors facing each other. I don't know. Whatever it has to be to make this work. So everytime the photon makes a revolution around this loop the switch can then decide weather or not it wants to send this entangled photon back to the loop again, down the second path, or down the third. The second path leads to a polarizer and then to a detector like in the erasure experiment and the third path leads to just the detector bypassing the polarizer. If you look at the pattern that s photon produces won't that tell you which path that p photon eventually went down? or basically weather or not it bothered to go through erasure process?

For instance I build a machine that is tied to the switch. The machine is programmed so that if the Browns win the superbowl in the future it switches the path of p photon to the polarizer and if they lose it bypasses the polarizer and goes straight to the detector. Now by weather or not I see and interference pattern from s photon I can then know which path the p photon will go and hence weather or not the browns will win the super bowl.

Am I way off base here? This is kind of a troubling thought. Any answers would be great. Thanks.
 
Physics news on Phys.org
tokyoburns said:
If you look at the pattern that s photon produces won't that tell you which path that p photon eventually went down? or basically weather or not it bothered to go through erasure process?

No, the s-photon pattern never changes, irrespective of what you do. you will find all the interesting patterns only in the coincidence counts between the detectors for the p and s photons.

Therefore, you may find some interesting pattern in the coincidence counts between the detector detecting the s photon and the detector in p-photon path 2 and you may find another interesting pattern in the coincidence counts between the detector detecting the s-photon and the detector in p-photon path 3, but the pattern of s alone will be the same in all these cases.
 
i see. I guess i don't understand the coincidence counter part well enough. I'll have to look up a good explanation of it. thanks for your answer. this has been bugging me all weekend.
 
Thread closed for Moderation...

Thread will remain closed. User account terminated due to inappropriate username.
 
Last edited:

Similar threads

  • · Replies 41 ·
2
Replies
41
Views
7K
  • · Replies 13 ·
Replies
13
Views
2K
Replies
3
Views
2K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 38 ·
2
Replies
38
Views
6K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 28 ·
Replies
28
Views
3K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 16 ·
Replies
16
Views
3K