Fig. 3 | Nature Communications

Fig. 3

From: Quantum wave mixing and visualisation of coherent and superposed photonic states in a waveguide

Fig. 3

Quantum wave mixing with non-classical states. a Two consecutive pulses at ω and then at ω + are applied to the artificial two-level atom. The plot exemplifies the QWM power spectrum from the zero-one photon coherent state \({\left| \beta \right\rangle _ - }\). The single side peak at 2ω + − ω appears, due to the transformation of \({\left| \beta \right\rangle _ - }\) (one photon, N ph = 1, from \({\left| \beta \right\rangle _ - }\) and two photons from \({\left| \alpha \right\rangle _ \pm }\)). b The peak amplitude dependences at several side-peak positions in classical (left column) and quantum with the two-level atom (right column) wave mixing regimes as functions of both driving amplitudes (α ±) expressed in photons per cycle. Several side peaks are clearly visible in the classical regime. This is in striking difference from the quantum regime, when only one peak at 2ω + − ω is observed and behaves qualitatively similar to the one in the classical regime

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