  We investigate the quantum entanglement between two quantum dots in a
plasmonic waveguide with near-zero mode index, considering the dependence of
concurrence on interdot distance, quantum dot-waveguide frequency detuning and
coupling strength ratio. High concurrence is achieved for a wide range of
interdot distance due to the near-zero mode index, which largely relaxes the
strict requirement of interdot distance in conventional dielectric waveguides
or metal nanowires. The proposed quantum dot-waveguide system with near-zero
phase variation along the waveguide near the mode cutoff frequency shows very
promising potential in quantum optics and quantum information processing.
