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Stefano Maffezzoli Felis edited Energies.tex
over 8 years ago
Commit id: b113601eb3d473a3fd0b92a7392ef34795f88325
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\end{equation}
Calculate now the matrix's elements in the basis of the eigenstates (\ref{eqn:basis}) in order to find later the eigenenergies of the system
%\begin{equation} \begin{equation}
\begin{align}
&=\epsilon_N\delta_{sn}\delta_{tm}\\
&=\epsilon_1(1-\delta_{sn})\delta_{tm}+\epsilon_2\delta_{sn}(1-\delta_{tm})\\
&=-\epsilon_{12}(nm)\delta_{sn}\delta_{tm}
\end{align}
% \label{eqn:Matrix_Elements}
%\end{equation} \end{equation}
where $\bar{n}$ is the negation of $n$, $H_1=\hbar\omega_0 D^{\dagger}(\omega^{-1}_0 \hat{\gamma})\adag a D(\omega^{-1}_0 \hat{\gamma})$, $H_2=\hbar \frac{\omega_1}{2}\sigma^{(1)}_z + \hbar \frac{\omega_2}{2}\sigma^{(2)}_z$, $H_3=- 2\hbar\frac{\Gamma_1\Gamma_2}{\omega^2}\sigma^{(1)}_x\otimes\sigma^{(2)}_x$, $\epsilon_N=\hbar\omega_0 N$, $\epsilon_1=\hbar \frac{\omega_1}{2}$, $\epsilon_2= \hbar \frac{\omega_2}{2}$ and $\epsilon_{12}=2\hbar\frac{\Gamma_1\Gamma_2}{\omega_0^2}$. One can easily identify two diagonal terms and an off-diagonal one.
The overlap between two displaced number states $|N_{nm}>$ is