Entanglement Swapping with Semiconductor-Generated Photons Violates Bell’s Inequality

Michael Zopf, Robert Keil, Yan Chen, Jingzhong Yang, Disheng Chen, Fei Ding, Oliver G. Schmidt

Abstract

Transferring entangled states between photon pairs is essential in quantum communication. Semiconductor quantum dots are the leading candidate for generating polarization-entangled photons deterministically. Here we show for the first time swapping of entangled states between two pairs of photons emitted by a single dot. A joint Bell measurement heralds the successful generation of the Bell state Ψ^{+}, yielding a fidelity of 0.81±0.04 and violating the CHSH and Bell inequalities. Our photon source matches atomic quantum memory frequencies, facilitating implementation of hybrid quantum repeaters.

Locations

• Physical Review Letters - View
• arXiv (Cornell University) - View - PDF
• Institutional Repository of Leibniz Universität Hannover (Leibniz Universität Hannover) - View - PDF
• PubMed - View
• DataCite API - View