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

authored by

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.

Organisation(s)

Institute of Solid State Physics
QuantumFrontiers

External Organisation(s)

Leibniz Institute for Solid State and Materials Research Dresden (IFW)
Chemnitz University of Technology (CUT)

Type

Article

Journal

Physical review letters

Volume

123

No. of pages

7

ISSN

0031-9007

Publication date

18.10.2019

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

Electronic version(s)

https://doi.org/10.15488/5545 (Access: Open)
https://doi.org/10.1103/PhysRevLett.123.160502 (Access: Closed)