  We devise a method to shortcut the adiabatic evolution of a spin-1 Bose gas
with an external magnetic field as the control parameter. An initial many-body
state with almost all bosons populating the Zeeman sublevel $m=0$, is evolved
to a final state very close to a macroscopic spin-singlet condensate, a
fragmented state with three macroscopically occupied Zeeman states. The
shortcut protocol, obtained by an approximate mapping to a harmonic oscillator
Hamiltonian, is compared to linear and exponential variations of the control
parameter. We find a dramatic speedup of the dynamics when using the shortcut
protocol.
