Nonlinear spectroscopy with time- and frequency-gated photon counting: A superoperator diagrammatic approach

摘要

We present a diagrammatic technique for calculating quantum-detected nonlinear optical signals usingnloop diagrams that act in the joint matter plus field space. This formalism, which is based on time-orderednsuperoperators keeps track of the entangled matter plus field state, making it most suitable for spectroscopynapplications. Photon counting is recast as a time and frequency convolution of a bare signal, which is given by ancorrelation function of matter, and a gating spectrogram.