A simple scheme for expanding a polarization-entangledWstate by adding one photon
Yan-Xiao Gong, Xu‐Bo Zou, Yun‐Feng Huang, Guang‐Can Guo · Journal of Physics B Atomic Molecular and Optical Physics · 2009
We propose a simple scheme for expanding a polarization-entangled W state. By mixing a single photon and one of the photons in an n -photon W state at a polarization-dependent beam splitter (PDBS), we can obtain an ( n + 1)-photon W state after post-selection. Our scheme also opens the door to generating n -photon W states using single photons and linear optics.