The generation of an entangled four-photon W-state by using linear optical elements
Xu‐Bo Zou, K. Pahlke, Wolfgang M. Mathis · arXiv (Cornell University) · 2002
We present a scheme to produce an entangled four-photon W-state by using linear optical elements. The symmetrical setup of linear optical elements consists of four beam splitters, four polarization beam splitters and four mirrors. A photon EPR-pair and two single photons are required as the input modes. The projection on the W-state can be made by a four-photon coincidence measurement. Further, we show that by means of a horizontally oriented polarizer in front of one detector the W-state of three photons can be generated.