  We consider dynamically generated spin squeezing in interacting bimodal
condensates. We show that particle losses and non-zero temperature effects in a
multimode theory completely change the scaling of the best squeezing for large
atom numbers. We present the new scalings and we give approximate analytical
expressions for the squeezing in the thermodynamic limit. Besides reviewing our
recent theoretical results, we give here a simple physical picture of how
decoherence acts to limit the squeezing. We show in particular that under
certain conditions the decoherence due to losses and non-zero temperatureacts
as a simple dephasing.
