Tavis-Cummings model
= Tavis-Cummings model
{c}
{title2=$H_I=\hbar\sum_jg_j(a\sigma_+^{(j)}+a^\dagger\sigma_-^{(j)})$}
The <Tavis-Cummings model> extends the <Jaynes-Cummings model> to several <two-level systems> exchanging excitations with a common quantized <normal mode> under the <rotating-wave approximation>. It conserves total excitation number. Equal coupling preserves permutation-symmetric atomic sectors, allowing finite-dimensional reductions for a fixed initial excitation number.