Enhancing biexciton absorption by entangled photons in quantum dot system

Entangled quantum light offers a unique pathway to control and enhance nonlinear optical processes in low-dimensional semiconductors. In this work, we investigate biexciton generation in quantum dots driven by entangled photon pairs produced via spontaneous parametric down-conversion (SPDC). Such processes are fundamental to understanding the optical response of condensed-phase systems and hold significance for quantum information technologies, including quantum computing and light-emitting devices.

We parameterize the quantum dot Hamiltonian using the semi-empirical pseudopotential method and employ a quantum master equation framework to describe the resulting excitonic and biexcitonic dynamics. Our simulations reveal enhanced biexciton generation efficiency under optimized entangled photon excitation, highlighting the critical role of quantum correlations in the driving field. Furthermore, we analyze the dependence of this enhancement on material parameters and phonon interactions, establishing quantitative connections with recent experimental observations.

These results demonstrate the potential of quantum light spectroscopy to overcome the limitations of classical excitation techniques, providing new insights into many-body interactions and opening avenues for coherent control of quantum states in semiconductor nanostructures.