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Coupling $N$ identical emitters to the same field mode is well-establishedmethod to enhance light matter interaction. However, the resulting $\sqrt{N}$boost of the coupling strength comes at the cost of a "linearized" (effectivelysemi-classical) dynamics. Here, we instead demonstrate a new approach forenhancing the coupling constant of a \textit{single} quantum emitter, whileretaining the nonlinear character of the light-matter interaction. We considera single quantum emitter with $N$ nearly degenerate transitions that arecollectively coupled to the same field mode. We show that in such conditions aneffective Jaynes-Cummings model emerges, with a boosted coupling constant oforder $\sqrt{N}$. The validity and consequences of our general conclusions areanalytically demonstrated for the instructive case $N=2$. We further observethat our system can closely match the spectral line shapes and photonautocorrelation functions typical of Jaynes-Cummings physics, hence provingthat quantum optical nonlinearities are retained. Our findings match up verywell with recent broadband plasmonic nanoresonator strong-coupling experimentsand will therefore facilitate the control and detection of single-photonnonlinearities at ambient conditions.

Single Quantum Emitter Dicke Enhancement