Generation of Multiphoton Entangled States with Linear Optical Elements
Sheng Yu-Bo, Deng Fu-Guo, Hong-Yu Zhou · Chinese Physics Letters · 2008
We propose a linear optical protocol to generate three-photon and four-photon entangled states without resorting to entangled sources. The setup in this protocol is composed of three beam splitters and two half-wave plates. We can obtain three-photon and four-photon entangled states with postselection, as with other protocols. This protocol has the advantage of high efficiency and is more feasible than others.