We　describe　a　procedure　for　splitting　quantum　information　into　two　or　more　parts　so　that　if　and　only　if　the　recipients　cooperate,　the　original　qubit　can　be　reconstructed.　Our　scheme　uses　W-type　entangled　states　as　the　quantum　channel　and　thus　the　scheme　is　robust　against　decoherence.　We　illustrate　the　procedure　in　the　ion-trap　system,　but　the　idea　can　also　be　realized　in　other　systems.　©　2006　The　American　Physical　Society.