Generating polarization-entangled W states using weak nonlinearity
Ming Yuan Gao, Wenhua Hu, Cheng-Zu Li · Journal of Physics B Atomic Molecular and Optical Physics · 2007
We present a scheme for preparing three-photon polarization-entangled W states. The signal photons and a strong probe field interact via weak cross-Kerr nonlinearity that conditionally causes a phase shift on the probe coherent state. A W state is then prepared with a high success probability by the homodyne measurement and postselection. The generating method is simple and efficient.