  Quantum electromagnetic fluctuations induce forces between neutral particles,
known as the van der Waals (vdW) and Casimir interactions. These fundamental
forces, mediated by virtual photons from the vacuum, play an important role in
basic physics and chemistry, and in emerging technologies involving, e.g.
micro-electromechanical systems or quantum information processing. Here we show
that these interactions can be enhanced by many orders of magnitude upon
changing the character of the mediating vacuum-modes. By considering two
polarizable particles in the vicinity of any standard electric transmission
line, along which photons can propagate in one dimension (1d), we find a much
stronger and longer-range interaction than in free-space. This enhancement may
have profound implications on many-particle and bulk systems, and impact the
quantum technologies mentioned above. The predicted giant vacuum force is
estimated to be measurable in a coplanar waveguide line.
