Coulomb drag between one-dimensional conductors

We have analyzed Coulomb drag between currents of interacting electrons in two parallel one-dimensional conductors of finite length $L$ attached to external reservoirs. For strong coupling, the relative fluctuations of electron density in the conductors acquire energy gap $M$. At energies larger than $\mathrm{\Gamma }=const\times v_{-}\exp (-LM\mathrm{/}{v}_{-})\mathrm{/}L+{\mathrm{\Gamma }}_{+}$, where ${\mathrm{\Gamma }}_{+}$ is the impurity scattering rate, and for $L>v_{-}\mathrm{/}M$, where $v_{-}$ is the fluctuation velocity, the gap leads to an ``ideal’’ drag with almost equal currents in the conductors. At low energies the drag is suppressed by coherent instanton tunneling, and the zero-temperature transconductance vanishes, indicating the Fermi liquid behavior.