Single quantum emitter Dicke enhancement

Coupling $N$ identical emitters to the same field mode is well-established method enhance light matter interaction. However, resulting $\sqrt{N}$ boost of coupling strength comes at cost a "linearized" (effectively semi-classical) dynamics. Here, we instead demonstrate new approach for enhancing constant \textit{single} quantum emitter, while retaining nonlinear character light-matter We consider single emitter with nearly degenerate transitions that are collectively coupled mode. show in such conditions an effective Jaynes-Cummings model emerges, boosted order $\sqrt{N}$. The validity and consequences our general conclusions analytically demonstrated instructive case $N=2$. further observe system can closely match spectral line shapes photon autocorrelation functions typical physics, hence proving optical nonlinearities retained. Our findings up very well recent broadband plasmonic nanoresonator strong-coupling experiments will therefore facilitate control detection single-photon ambient conditions.