Generation of frequency entanglement with an effective quantum dot-waveguide two-photon quadratic interaction
Abstract
Light-matter interactions with quantum dots have been extensively studied to harness key quantum properties of photons, such as indistinguishability and entanglement. In this theoretical work, we exploit the atomic-like four-level structure of a quantum dot coupled to a waveguide to model a shaping frequency entangling gate (FrEnGATE) for single photons. Our approach is based on the identification of input frequencies and an atomic level structure for which frequency-dependent one-photon transitions are adiabatically eliminated, while frequency-dependent two-photon transitions are resonantly enhanced. The frequency entanglement performance of the gate is analyzed using a Schmidt decomposition for continuous variables, revealing a trade-off between entanglement generation efficiency and entanglement quality. We further demonstrate the use of the FrEnGATE for the generation of entangled frequency qudit states.
Cite
@article{arxiv.2505.10121,
title = {Generation of frequency entanglement with an effective quantum dot-waveguide two-photon quadratic interaction},
author = {Mohamed Meguebel and Maxime Federico and Simone Felicetti and Nadia Belabas and Nicolas Fabre},
journal= {arXiv preprint arXiv:2505.10121},
year = {2025}
}