  We investigate the degree of coherence of electronic transport through a
quantum dot (QD) in the presence of an intradot electron-electron interaction.
By using an open multi-terminal Aharonov-Bohm (AB) setup, we find that the
intradot interaction does not induce any dephasing effect and the electron
transport through the QD is fully coherent. We also observe that the asymmetric
amplitude of the AB oscillation in the conductance through the two-terminal AB
setup originates from the interplay between the confined structure and the
electron-electron interaction. Thus, one can not associate a dephasing process
with this asymmetric amplitude, as has been done in previous studies.
