# Quantum Mollow Quadruplet in Nonlinear Cavity QED.

@article{Allcock2022QuantumMQ, title={Quantum Mollow Quadruplet in Nonlinear Cavity QED.}, author={Thomas Tunstall Allcock and Wolfgang Werner Langbein and E A Muljarov}, journal={Physical review letters}, year={2022}, volume={128 12}, pages={ 123602 } }

We develop an exact analytical approach to the optical response of a two-level system coupled to a microcavity for arbitrary excitation strengths. The response is determined in terms of the complex amplitudes of transitions between the rungs of the Jaynes-Cummings ladder, explicitly isolating nonlinearities of different orders. Increasing the pulse area of the excitation field, we demonstrate the formation of a quantum Mollow quadruplet (QMQ), quantizing the semiclassical Mollow triplet into a…

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