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This is achieved by doing the first iteration in
We take
for simplicity and the initial state therefore is
,
This can be worked out in some more detail by assuming a basis
of eigenstates of
,
Let us assume the initial state
is an eigenstate of
, then
The probability to find the system in state
after time
is then a transition probability.
Use
(EXERCISE:CHECK!) to find within first order perturbation theory
Subsections
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Tobias Brandes
2005-04-26