  Entanglement of identical massive particles recently gained attention,
because of its relevance in highly controllable systems, e.g. ultracold gases.
It accounts for correlations among modes instead of particles, providing a
different paradigm for quantum information. We prove that the entanglement of
almost all states rarely vanishes in the presence of noise, and analyse the
most relevant noise in ultracold gases: dephasing and particle losses.
Furthermore, when the particle number increases, the entanglement decay can
turn from exponential into algebraic.
