# Continuous generation of quantum light from a single ground-state atom in an optical cavity

## TL;DR

This paper demonstrates a scheme for continuous quantum light generation using a single three-level atom in an optical cavity, leveraging quantum interference and strong atom-cavity coupling to produce single photons and complex quantum states.

## Contribution

It introduces a novel optical wave-mixing method for quantum light generation with a single atom, enabling control over photon emission and quantum state creation.

## Key findings

- Single-photon emission via dark state transitions
- Generation of coherent and Schrödinger cat-like fields
- Quantum interference suppresses atomic excitation

## Abstract

We show an optical wave-mixing scheme that generates quantum light by means of a single three-level atom. The atom couples to an optical cavity and two laser fields that together drive a cycling current within the atom. Weak driving in combination with strong atom-cavity coupling induces transitions between the dark states of the system, accompanied by single-photon emission and suppression of atomic excitation by quantum interference. For strong driving, the system can generate coherent or Schr\"odinger cat-like fields with frequencies distinct from those of the applied lasers.