Four-Photon Polarization-Entangled States with Minimal Spectral and Spatial Entanglement
Warren P. Grice, J. Schaake, Travis S. Humble · 2012
We present two schemes for generating four-photon states: one for direct GHZ state generation and another yielding an entire class of polarization-entangled states. Both begin with photon pairs having minimal spectral and spatial entanglement.