Abstract

Entanglement swapping forms a key concept in the realization of scalable quantum networks and large-scale quantum communication. For the practical implementation of entanglement swapping, completely autonomous entanglement sources and a joint Bell-state measurement (BSM) between two independent photons are essential. Here, we experimentally demonstrate entanglement swapping between two independent polarization-entangled photon-pair sources obtained via spontaneous four-wave mixing (SFWM) in a Doppler-broadened atomic ensemble of ${^{87}}{\rm Rb}$ atoms. From the joint BSM, we estimate the ${\rm S}$ parameter in the Clauser–Horne–Shimony–Holt (CHSH) form of Bell’s inequality and confirm the violation of the Bell–CHSH inequality by ${\rm S}={2.32} \pm {0.07}$ with 4.5 standard deviations. We believe that this work is an important step toward realizing practical scalable quantum networks.

© 2020 Optical Society of America

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