Steady-state generation of Wigner negative states in 1D resonance fluorescence

In this work we demonstrate numerically that the nonlinearity provided by a continuously driven two-level system (TLS) allows for the generation of Wigner-negative states of the electromagnetic field confined in one spatial dimension. Wigner-negative states, a.k.a. Wigner nonclassical states, are desirable for quantum information protocols beyond the scope of classical computers. Focusing on the steady-state emission from the TLS, we find the largest negativity at the drive strength where the coherent reflection vanishes.