Simple scheme for generating four-photon polarization-entangled decoherence-free states using spontaneous parametric down-conversions
Xu‐Bo Zou, Jing Shu, Guang‐Can Guo · Physical Review A · 2006
We propose a simple scheme for the generation of four-photon polarization-entangled decoherence-free states by using a pair of spontaneous parametric down-conversions and one tunable beam splitter. The scheme is based on post-selection strategy and feasible by current experimental technology.