Kakande, J. Slavík, R. Parmigiani, F. Bogris, A. Syvridis, D. Grüner-Nielsen, L. Phelan, R. Petropoulos, P. Richardson, D.J., Multilevel quantization of optical phase in a novel coherent parametric mixer architecture, Nature Photonics, (5), 748-752, 2011, 1749-4885, 1749-4893