  We have embedded an artificial atom, a superconducting transmon qubit, in a
1D open space and investigated the scattering properties of an incident
microwave coherent state. By studying the statistics of the reflected and
transmitted fields, we demonstrate that the scattered states can be
nonclassical. In particular, by measuring the second-order correlation
function, $g^{(2)}$, we show photon antibunching in the reflected field and
superbunching in the transmitted field. We also compare the elastically and
inelastically scattered fields using both phase-sensitive and phase-insensitive
measurements.
