Reflection and the measurement, and time irreversibility

  • Thread starter Dmitry67
  • Start date
  • #1
2,471
1
Reflection is not considered to be a measurement. Reflection, like using lenses is considered to be a time-reversible process. It is not a measurement and it does not erase the coherence (interference pattern)

Here is what I dont understand

What happens to the momentum of the photon? The light pressure? If I put a mirror (flying in a zero gravity and vacuum) right behind 2 slits, mirror will start rotating very slowly in a different directions depending on the path of the photon

Where is a flaw?
 

Answers and Replies

  • #2
Avodyne
Science Advisor
1,396
88
If you can measure the mirror's momentum well enough to detect which slit the photon went through, the posistion will be uncertain enough to destroy the interference pattern.
 
  • #3
2,471
1
My mirror is flying in the empty space. If it is hit by 1 photon, it begins to rotate making 1 full rotation per 1 year. So I make an experiment and decide to check the position of a mirror 3 month later. What is going to happen to the interference pattern?
 

Related Threads on Reflection and the measurement, and time irreversibility

Replies
5
Views
495
  • Last Post
Replies
2
Views
2K
Replies
4
Views
715
  • Last Post
Replies
4
Views
598
  • Last Post
3
Replies
57
Views
3K
  • Last Post
Replies
18
Views
1K
Replies
2
Views
2K
  • Last Post
Replies
2
Views
551
Replies
1
Views
627
  • Last Post
Replies
5
Views
4K
Top