We present the two kinds of experimental results. One is a continuous variable dense coding experiment, and the other is a photon number detector with high linearity response, the so called charge integration photon detector (CIPD). They can be combined together to be a potential tool for implementing the cubic phase gate which is an important gate element to synthesize the measurement induced nonlinearity for photonic quantum information processing.
@article{arxiv.quant-ph/0601058,
title = {EPR Beams and Photon Number Detector: Toward Synthesizing Optical Nonlinearity},
author = {M. Sasaki and K. Wakui and J. Mizuno and M. Fujiwara and M. Akiba},
journal= {arXiv preprint arXiv:quant-ph/0601058},
year = {2007}
}