Shortcut to adiabaticity in spinor condensates
  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. 
Arnau Sala, David L\'opez N\'u\~nez, Joan Martorell, Luigi De Sarlo,   Tilman Zibold, Fabrice Gerbier, Artur Polls, Bruno Ju...
cond-mat.quant-gas