Detecting two photons with one molecule

We apply input-output theory with quantum pulses [A. H. Kiilerich, K. M.olmer, Phys. Rev. Lett. 123, 123604 (2019)] to a model of a type of two-photon detector consisting of one molecule that can detect two photons arriving sequentially in time. The underlying process is distinct from the usual two-photon absorption process where two photons arriving simultaneously and with frequencies adding up to the resonance frequency are absorbed by a single molecule in one quantum jump. Our detector model includes a Hamiltonian description of the amplification process necessary to convert the microscopic change in the single molecule to a macroscopic signal.

Automated summary

This article introduces a model for describing a type of two-photon detector consisting of one molecule that can detect two photons arriving sequentially in time. The detector model includes a Hamiltonian description for amplifying the microscopic change and converting it into a macroscopic signal.