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

TL;DR

This paper demonstrates numerically that a driven two-level system can generate steady-state Wigner-negative nonclassical states in one-dimensional resonance fluorescence, which are useful for quantum information processing.

Contribution

It introduces a method to produce steady-state Wigner-negative states using a nonlinear two-level system in 1D resonance fluorescence.

Findings

Maximum negativity occurs at drive strength where coherent reflection vanishes.

Wigner-negative states are generated in the steady state of a driven TLS.

Numerical evidence supports the feasibility of producing nonclassical states in this setup.

Abstract

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.