B What causes quantum uncertainty?

  • Thread starter Ampulla
  • Start date
5
1
What causes quantum uncertainty? My friend who's working for Apknite says that detectors are not the cause of wave collapse, because you are measuring something that isn't remaining in the same state.
 

atyy

Science Advisor
13,500
1,609
The cause of quantum uncertainty is unknown, and cannot be answered at the present state of science.
 
9,143
2,058
The cause of quantum uncertainty is unknown, and cannot be answered at the present state of science.
It's caused by observables not commuting. Why do say position and momentum not commute? The answer is symmetry as can be found in chapter 3 of Ballentine - QM - A Modern Approach. The hidden assumption is it proves certain observables defined by symmetry have exactly the same relationships as classical physics. Taking Erenfest's Theorem into account it makes sense to define these operators as their corresponding classical quantities. To bring the correspondence into logical order you define momentum and position operators as the quantum operators found from symmetry, then say the corresponding quantities from Erenfest is their definition classically. So the question is why does symmetry and the above logic lead to exactly the same definition found in classical mechanics? I am not sure the exact reason is known, but we have some very advanced QM experts that post here who may be able to elucidate it further. My suspicion is Feynman's Path Integral approach has something to do with it.

Thanks
Bill
 
Last edited:

Want to reply to this thread?

"What causes quantum uncertainty?" You must log in or register to reply here.

Related Threads for: What causes quantum uncertainty?

Replies
13
Views
1K
Replies
1
Views
2K
Replies
1
Views
2K
Replies
6
Views
2K
Replies
17
Views
10K
Replies
7
Views
650
  • Posted
Replies
1
Views
1K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top