  A coherent superposition of many nuclear spin states can be prepared and
manipulated via the hyperfine interaction with the electronic spins by varying
the Landau level filling factor through the gate voltage in appropriately
designed Quantum Hall Ferromagnet. During the manipulation periods the 2D
electron system forms spatially large Skyrmionic spin textures, where many
nuclear spins follow locally the electron spin polarization. It is shown that
the collective spin rotation of a single spin texture is gapless in the limit
of zero Zeeman splitting, and may dominate the nuclear spins relaxation and
decoherence processes in the quantum well.
