Strong coupling of two quantum emitters to a single light mode: the dissipative Tavis-Cummings ladder

TL;DR

This paper establishes a criterion for strong coupling in a two-emitter cavity QED system, constructs the dissipative Tavis-Cummings ladder, and shows that adding more emitters broadens the parameter range for observing higher-order Rabi splittings.

Contribution

It introduces a new criterion for strong coupling considering dissipation and extends the Tavis-Cummings model to multiple emitters, revealing enhanced Rabi splitting conditions.

Findings

Inclusion of more emitters increases the parameter space for Rabi splitting.

The dissipative Tavis-Cummings ladder is constructed considering photon escape and spontaneous emission.

The criterion helps identify strong coupling regimes in realistic cavity QED systems.

Abstract

A criterion for strong coupling between two quantum emitters and a single resonant light mode in a cavity is presented. The criterion takes into account the escape of cavity photons and the spontaneous emission of the emitters, which are modeled as two level systems. By using such criterion, the dissipative Tavis-Cummings ladder of states is constructed, and it is shown that the inclusion of one more emitter with respect to the Jaynes-Cummings (single emitter) case increases the effective parameter region in which $n^{\text{th}}$ order Rabi splitting is observed.