Measurement problem in double slit experiment

In summary, the double slit experiment of electron shows an interference pattern when the electron's path is unknown and no interference pattern when the path is known. To determine the path, photons are used, but this destroys the interference pattern. This is due to the interaction between photons and electrons. However, whether the photons are caught or not, the interference pattern is destroyed if the wavelength of light is small enough to accurately locate the electrons. This has been supported by experimental evidence and theoretical analysis. It suggests that the experiment should be done in the dark to observe the interference pattern. References discussing this phenomenon can be provided upon request.
  • #1
mritunjay
18
0
In double slit experiment of electron, we see an interference pattern when we don’t know through which slit electron has passed and we don’t see an interference pattern when we know through which slit electron has passed. Now, to identify the slit through which electron has passed, we use photons. We see at slits using photons and this act destroys the interference pattern. We say that interaction of photon with electron is destroying the interference pattern. But photons are always colliding (and hence interacting) with electrons while it is passing through the slits. So, how come this interaction affects the interference pattern only when we catch the photon i.e. only when we observe the electron and not when photon is simply colliding with electron and we don’t catch that photon?
 
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  • #2
Doesn't matter if the photons are caught or not. The interference pattern is destroyed as long as there is light present with a wavelength that is small enough to locate the electrons with sufficient accuracy to distibguish between the two slits.
 
  • #3
dx said:
Doesn't matter if the photons are caught or not. The interference pattern is destroyed as long as there is light present with a wavelength that is small enough to locate the electrons with sufficient accuracy to distibguish between the two slits.

thanks a lot for the reply. but I have some doubts. how do you know that this will happen? is there any experimental evidence or any theoretical analysis? if whatever you are saying is correct, then it means we have to do the experiment in dark. in the presence of light, we won't get interferance pattern whether we try to locate the electron or not. (can you give some referances where this is discussed)
 

What is the measurement problem in the double slit experiment?

The measurement problem in the double slit experiment refers to the observation that particles behave differently when they are being observed compared to when they are not being observed. This phenomenon challenges our understanding of the nature of particles and their behavior.

What is the significance of the double slit experiment?

The double slit experiment is significant because it is a fundamental experiment that demonstrates the wave-particle duality of matter. It shows that particles can behave like waves under certain conditions, and this has implications for our understanding of quantum mechanics and the nature of reality.

How does the measurement process affect the outcome of the double slit experiment?

The act of measurement or observation collapses the wave function of the particles, causing them to behave like particles rather than waves. This means that the measurement process itself affects the outcome of the experiment, leading to the measurement problem.

What are some proposed solutions to the measurement problem in the double slit experiment?

Some proposed solutions to the measurement problem include the Copenhagen interpretation, which states that particles exist in a superposition of states until they are observed or measured, and the Many-Worlds interpretation, which suggests that every possible outcome of a measurement exists in a separate parallel universe.

How does the measurement problem impact our understanding of reality?

The measurement problem challenges our traditional understanding of reality and raises questions about the nature of particles and their behavior. It also highlights the limitations of our current scientific theories and suggests that there may be more to the universe than we can currently comprehend.

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