Let VA), B) be the eigenvectors of the Hamiltonian ♬ of a two-level system Ĥ|VA,B) = EA,B|VA,B) EA> EB. Another basis ₁), 2), with is related to A), VB) by (W₁|yj) = dij i, j = 1,2 WA,B) = (|¥₁) ± | ¥₂)). Find the matrix elements of the Hamiltonian Â' in the basis ₁), ₂) using the dyadic notation and the matrix notation. Then, assuming that at time t=0 the system is in ₁), find the time evolved state using the time dependence of the Ĥ eigenstates, and calculate the time t such that for the first time the system has probability 1 to be in 42). Show how one obtains the same result by the time evolution operator. Assume ħ 1 for simplicity. = =

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Let VA), VB) be the eigenvectors of the Hamiltonian Ĥ of a two-level system
ĤVA,B) = EA,BVA,B) EA> EB.
Another basis ₁), 2), with
is related to A), VB) by
(W₁|yj) = Sij i, j = 1,2
|WA,6) = √2(191₁) ±|y₂)).
Find the matrix elements of the Hamiltonian Â' in the basis ₁), 2) using the
dyadic notation and the matrix notation. Then, assuming that at time t=0 the system
is in ₁), find the time evolved state using the time dependence of the Ĥ eigenstates,
and calculate the time t such that for the first time the system has probability 1 to
be in 2). Show how one obtains the same result by the time evolution operator.
Assume ħ 1 for simplicity.
Transcribed Image Text:Let VA), VB) be the eigenvectors of the Hamiltonian Ĥ of a two-level system ĤVA,B) = EA,BVA,B) EA> EB. Another basis ₁), 2), with is related to A), VB) by (W₁|yj) = Sij i, j = 1,2 |WA,6) = √2(191₁) ±|y₂)). Find the matrix elements of the Hamiltonian Â' in the basis ₁), 2) using the dyadic notation and the matrix notation. Then, assuming that at time t=0 the system is in ₁), find the time evolved state using the time dependence of the Ĥ eigenstates, and calculate the time t such that for the first time the system has probability 1 to be in 2). Show how one obtains the same result by the time evolution operator. Assume ħ 1 for simplicity.
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