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We investigate the prospects of atomic interference using samples of Bose condensed atoms. First we show the ability of two independent Bose condensates to create an interference pattern. This holds even if both condensates are described by Fock states. Thus, the existence of an experimental signature for a broken gauge symmetry, seen in a single run of the experiment, is not necessarily reflected by a broken symmetry on the level of the quantum mechanical state vector. Based on these results, we simulate numerically a recent experiment with two independent Bose condensates K. B. Davis et al. , Phys. Rev. Lett. 75, 3969 (1995). The existence of interference fringes is predicted based on the nonlinear Schr\"odinger equation. Finally we study theoretically the influence of finite temperatures on the visibility of the interference in a double pinhole configuration. 1996 The American Physical Society.
Naraschewski et al. (Sun,) studied this question.
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