We propose an alternative scheme to generate W state via optical state truncation using quantum scissors. In particular, these states may be generated through three-mode optical state truncation in a Kerr nonlinear coupler. The more general three-qubit state may be also produced if the system is driven by external classical fields.
@article{arxiv.quant-ph/0607161,
title = {Generation of Three-Qubit Entangled W-State by Nonlinear Optical State Truncation},
author = {R S Said and M R B Wahiddin and B A Umarov},
journal= {arXiv preprint arXiv:quant-ph/0607161},
year = {2007}
}