Dissipative quantum light field engineering

TL;DR

This paper proposes a dissipative scheme using a four-level atom in a bimodal cavity to generate entangled photon states, including NOON states, through a two-photon loss mechanism, enabling steady-state entanglement.

Contribution

It introduces a novel dissipative method for preparing strongly correlated and entangled photon states using a single atom and two-photon loss processes.

Findings

Steady states include NOON states and superpositions.

Entanglement is achieved in the cavity modes.

Output fields exhibit measurable quantum correlations.

Abstract

We put forward a dissipative preparation scheme for strongly correlated photon states. Our approach is based on a two-photon loss mechanism that is realised via a single four-level atom inside a bimodal optical cavity. Each elementary two-photon emission event removes one photon out of each of the two modes. The dark states of this loss mechanism are given by NOON states and arbitrary superpositions thereof. We find that the steady state of the two cavity modes exhibits entanglement and for certain parameters, a mixture of two coherent entangled states is produced. We discuss how the quantum correlations in the cavity modes and the output fields can be measured.