  We study the low frequency current correlations of an individual
single-walled carbon nanotube at liquid He temperature. We have distinguished
two physical regimes -- zero dimensional quantum dot and one dimensional
quantum wire -- in terms of an energy spacing from the finite tube length in
both differential conductance and shot noise measurements. In a one dimensional
wire regime, we observed a highly suppressed shot noise from all measured tube
devices, suggesting that electron-electron interactions play an important role.
