Interference seen in a member of an entangled pair

Click For Summary
In the discussed experiment involving entangled electrons, measuring the spin of one electron affects the potential for observing an interference pattern in the other electron. If the spin of the left electron is not measured, the right electron can exhibit an interference pattern on the screen. However, measuring the spin of the left electron provides which-slit information for the right electron, preventing the emergence of the interference pattern. The argument that this setup could allow for faster-than-light communication is flawed, as the measurements at one location do not influence the results at another location without prior communication. Ultimately, the entangled particles do not exhibit self-interference when one is measured, maintaining the principles of quantum mechanics.
  • #61
Have you studied at the actual mathematical analysis of how erasing the information in the apparatus is supposed to restore interference

Please see my post in the thread How do you determine that a particle is/was entangled?
 
Physics news on Phys.org
  • #62
One more try at realistic explanation.

Say the same experiment http://arxiv.org/abs/quant-ph/9810080
There they say "The coincidence peak was nearly noise-free (SNR > 100) with approximately Gaussian shape and a width (FWHM) of about 2 ns. All data reported here were calculated with a window of 6 ns."
If we draw coincidence graph not for all data but only for 45° coincidences and if it has not one peak but two peaks with equal height (conditional +- and -+ peaks) then ... well, case solved.
 

Similar threads

Undergrad Single vs. Double slit coherence clarification please
  • · Replies 7 ·
Replies
7
Views
576
High School Yet another double slit thought experiment...
  • · Replies 20 ·
Replies
20
Views
2K
High School The wave function of the electron doesn't collapse when passing through air?
  • · Replies 9 ·
Replies
9
Views
2K
High School Double slit experiment combined with Stern-Gerlach
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Delayed quantum eraser: turning off sensor to bring back interference
  • · Replies 24 ·
Replies
24
Views
4K
High School What is causing destructive interference in double slit experiment?
  • · Replies 32 ·
2
Replies
32
Views
4K
Undergrad Measuring electron spin and measuring entangled electron spin
  • · Replies 12 ·
Replies
12
Views
2K
High School Double Slit Experiment: Dumb question that needs to be asked
  • · Replies 60 ·
3
Replies
60
Views
7K
Undergrad Double slit experiment with observer
  • · Replies 14 ·
Replies
14
Views
4K
Undergrad Is it possible for a BBO crystal to produce an interference pattern?
  • · Replies 1 ·
Replies
1
Views
2K