2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/92621In this paper, first we explain what are the `quantum displacements'. We establish a group of bases, which contains the coupled bases coupling a ququart and a bipartite qubit systems. By these bases, we can realize the quantum displacements. We discuss some possible forms of them. At last, we point out that a so-call ''non-imprecisely-cloning theorem'' also holds.11 pages, no figures, revisionQuantum Physicstext