How large is the quantum enhancement of two-photon absorption by time-frequency entanglement of photon pairs?

We present a theoretical proof that the quantum enhancement of two-photon absorption, thought to be a means to improve molecular spectroscopy and imaging, is tightly bounded by the physics of photonic entanglement and nonlinear response. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

Through theoretical proof, it has been found that the quantum enhancement of two-photon absorption is tightly bounded by the physics of photonic entanglement and nonlinear response.