  We propose an experimentally viable setup for the realization of
one-dimensional ultracold atom gases in a nanoscale magnetic waveguide formed
by two doubly-clamped suspended carbon nanotubes. All common decoherence and
atom loss mechanisms are shown to be small. We discuss general consequences of
a non-parabolic confinement potential, in particular novel two-body shape
resonances, which could be observed in this trap.
