How large is the quantum enhancement of two-photon absorption by time-frequency entanglement of photon pairs?
Michael G. Raymer, Tiemo S. Landes, Markus Allgaier, Sofiane Merkouche, Brian J. Smith, Andrew H. Marcus · Optica · 2021
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.