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A theoretical physicist who calculated the spectrum of resonance fluorescence from a strongly driven chemical atom modeled as a two-level system. His 1969 treatment obtains the scattered-light power spectrum from two-time atomic dipole correlations, including radiation damping through the quantized electromagnetic field. The resulting Mollow triplet connects spectral structure to coherent driving and relaxation of a single quantum emitter.^[ref]

Resonance fluorescence is light emitted by a quantum emitter driven near one of its resonant transitions. The scattered field can contain both an elastic component at the drive frequency and inelastic components arising from the driven atomic dynamics.

For a strongly driven two-level emitter, the inelastic spectrum develops the Mollow triplet, with sidebands related to the drive-induced splitting. Photon-counting correlations can also show photon antibunching, distinguishing the emission statistics from a classical coherent field. Spectrum and counting statistics probe different features of the same emitter.^[ref]