- #1
dumpling
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Hi!
I would like to wrap my head around a relatively simple issue.
Lets say that you have an excited atom, which rests in your refernce frame.
When it emits light, the atom will have a backreaction, and it will "gain momentum" with the opposite direction as the photon.
Of course, without measurement, the photon's "wavefunction", or the spatial function of the electromagnetic mode excitation, would be spherical.
So would the wavefunction of the atom. However if we do measure position of the light, we neccesserily know which direction the atom has gone. (otherwise momentum conservation would not hold)
Is this right so far?
Does this imply that the light-atom wavefunction is a mixed state? I guess not, because the light can be diffracted.
Nevertheless my question is: How could one precisely describe the state of the whole system?
Can it be a sum of | atom one direction>|light opposite direction> ?
What would be a precise description?
Is the light alone in pure state?
is the atom alone in a pure state?
Thanks in advance.
I would like to wrap my head around a relatively simple issue.
Lets say that you have an excited atom, which rests in your refernce frame.
When it emits light, the atom will have a backreaction, and it will "gain momentum" with the opposite direction as the photon.
Of course, without measurement, the photon's "wavefunction", or the spatial function of the electromagnetic mode excitation, would be spherical.
So would the wavefunction of the atom. However if we do measure position of the light, we neccesserily know which direction the atom has gone. (otherwise momentum conservation would not hold)
Is this right so far?
Does this imply that the light-atom wavefunction is a mixed state? I guess not, because the light can be diffracted.
Nevertheless my question is: How could one precisely describe the state of the whole system?
Can it be a sum of | atom one direction>|light opposite direction> ?
What would be a precise description?
Is the light alone in pure state?
is the atom alone in a pure state?
Thanks in advance.