Photonic entanglement swapping with remote quantum dots.

Photonic entanglement swapping between two remote GaAs quantum dots is demonstrated with a fidelity as high as 0.71(2), exceeding the classical limit by more than 10 SDs.

• Why it matters: Scaling quantum networks needs nonprobabilistic emitters that avoid a trade-off between entanglement quality and photon-pair generation rate, beyond prior probabilistic remote-source demonstrations.
• What they did: Two deterministically embedded GaAs quantum dots in hybrid semiconductor-piezoelectric devices produce nearly identical entangled photon pairs, enabling interference-based swapping and comparison to a quantitative theoretical model.
• The result: The measured swapping data reach fidelity up to 0.71(2) and are explained by the model, which also suggests routes to boost protocol performance for quantum repeater networks.

AI summary of the abstract · may contain errors · not medical advice · read the paper.