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Energy levels of the two limiting cases of excitation: a, In the low excitation regime, the Jaynes–Cummings ladder (anticrossing magnified in inset) is probed by resonantly exciting a given rung of the ladder, with photon blockade at all others. b, In the high excitation regime: the laser dresses the QE while the cavity Purcell-enhances a N-photon transition from |−〉 to |+〉 (here for N = 2). A subsequent emission from the QE brings the system back to a |−〉 state.
