2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93981We find a one-parameter Gaussian state for an anharmonic oscillator with quadratic and quartic terms, which depends on the energy expectation value. For the weak coupling constant, the Gaussian state is a squeezed state of the vacuum state. However, for the strong coupling constant, the Gaussian state represents a different kind of condensation of bosonic particles through a nonlinear Bogoliubov transformation of the vacuum state.8 pages, RevTex, no figuresQuantum Physicstext