Sala, ArnauLópez Núñez, DavidMartorell Domenech, JuanSarlo, Luigi DeZibold, TilmanGerbier, FabriceJulia-Diaz, B.Polls Martí, Artur2019-02-192019-02-192016-10-122469-9926https://hdl.handle.net/2445/128469We 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.1 p.application/pdfeng(c) American Physical Society, 2016Condensació de Bose-EinsteinÀtomsBose-Einstein condensationAtomsinfo:eu-repo/semantics/article6676602019-02-19info:eu-repo/semantics/openAccess