I present an extensible experimental design for optical continuous-variable cluster states of arbitrary size using four offline (vacuum) squeezers and six beamsplitters. This method has all the advantages of a temporal-mode encoding [Phys. Rev. Lett. 104, 250503], including finite requirements for coherence and stability even as the computation length increases indefinitely, with none of the difficulty of inline squeezing. The extensibility stems from a construction based on Gaussian projected entangled pair states (GPEPS). The potential for use of this design within a fully fault tolerant model is discussed.
@article{arxiv.1007.3434,
title = {Temporal-mode continuous-variable cluster states using linear optics},
author = {Nicolas C. Menicucci},
journal= {arXiv preprint arXiv:1007.3434},
year = {2011}
}