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Updated: Jul 11, 2025

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
Signatures of the Optical Stark Effect on Entangled Photon Pairs from Resonantly Pumped Quantum Dots
F Basso Basset1, M B Rota1, M Beccaceci1
1Department of Physics, Sapienza University of Rome, 00185 Rome, Italy.
Abstract:
Two-photon resonant excitation of the biexciton-exciton cascade in a quantum dot generates highly polarization-entangled photon pairs in a near-deterministic way. However, the ultimate level of achievable entanglement is still debated. Here, we observe the impact of the laser-induced ac-Stark effect on the quantum dot emission spectra and on entanglement. For increasing pulse-duration-to-lifetime ratios and pump powers, decreasing values of concurrence are recorded. Nonetheless, additional contributions are still required to fully account for the observed below-unity concurrence.
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