Entangled Photon Triplets
Deny R. Hamel, Lynden K. Shalm, Hannes Hübel, Zhizhong Yan, Christoph Simon, Kevin J. Resch, Thomas D. Jennewein · 2013
We demonstrate entangled photon triplets from cascaded downconversion. First, we establish the presence of tripartite energy-time entanglement using a new entanglement criterion. Then we show a new source of three photon polarization GHZ states, verifying its quality with an entanglement witness.