Commit cfb2ed7d authored by T. van der Sar's avatar T. van der Sar
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Update 4_ZPFs.md - added some conclusions

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......@@ -149,6 +149,14 @@ It turns out that the variance of the number of photons in a coherent state, $\s
Coherent states have maximal "classical" energy, and even though they are (infinitely) large quantum superpositons, in some sense they are the most classical quantum states possible.
## Conclusions
- The expectation values of observables of stationary states do not depend on time.
- However, there are quantum fluctuations. These are related to the spread/curvature of the wavefunction.
- The coherent state is not a stationary state. Its time dynamics resembles that of a classical particle.
- The expectation values for position and momentum of the coherent state $|\alpha\rangle$ can expressed in terms of $\alpha$
# Homework Lecture 4
## Exercise 1
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