Images of a Bose-Einstein condensate: diagonal dynamical Bogoliubov vacuum

Details Images of a Bose-Einstein condensate: diagonal dynamical Bogoliubov vacuum Images of a Bose-Einstein condensate: diagonal dynamical Bogoliubov vacuum

2005-03-14

arxiv.org/abs/cond-mat/0503328v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 .eps figures

Scientific paper

Evolution of a Bose-Einstein condensate subject to a time-dependent external perturbation can be described by a time-dependent Bogoliubov theory: a condensate initially in its ground state Bogoliubov vacuum evolves into a time-dependent excited state which can be formally written as a time-dependent Bogoliubov vacuum annihilated by time-dependent quasiparticle annihilation operators. We prove that any Bogoliubov vacuum can be brought to a diagonal form in a time-dependent orthonormal basis. This diagonal form is tailored for simulations of quantum measurements on an excited condensate. As an example we work out phase imprinting of a dark soliton followed by a density measurement.

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