1999/02/11 by Jung Kon Kim, Sang Pyo Kim, Kwang-Gi Park
Physics and Astronomy · #quant-ph
published as J.Korean Phys.Soc. 34 (1999) 473-476 · 8 pages, RevTex, no figures
arxiv created 1999/02/11 · arxiv updated 2009/12/01
We 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.