  In a numerical study, we investigate the steady-state generation of
nonclassical states of light from a coherently driven two-level atom in a
one-dimensional waveguide. Specifically, we look for states with a negative
Wigner function, since such nonclassical states are a resource for quantum
information processing applications, including quantum computing. We find that
a waveguide terminated by a mirror at the position of the atom can provide
Wigner-negative states, while an infinite waveguide yields strictly positive
Wigner functions. Moreover, our investigation reveals a connection between the
purity of a quantum state and its Wigner negativity. We also analyze the
effects of decoherence on the negativity of a state.
