Experimental two-photon, three-dimensional entanglement for quantum communication.
Orbital angular momentum entangled photons emitted by a down-conversion source are in higher dimensional entangled states. Here we report the experimental confirmation by demonstrating a violation of a generalized Clauser-Horne-Shimony-Holt-type Bell inequality in three dimensions by more than 18 standard deviations. Higher dimensional entangled states allow the realization of new types of quantum communication protocols. They also provide a more secure quantum cryptography scheme. Therefore our experimental results are likely to have applications in future quantum communication technology.
Vaziri
Alipasha
A
Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, Austria.
Weihs
Gregor
G
Zeilinger
Anton
A