Quantum phase diffusion of a Bose system: beyond the Hartree-Fock-Bogoliubov approximation
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A diffusion process is usually assumed for the phase of the order parameter of a Bose system of finite size. The theoretical basis is limited to the so called Bogoliubov approximation. We show that a suitable generalization of the Hartree-Fock-Bogoliubov approach recovers phase diffusion.