We propose a deterministic implementation of weak cubic nonlinearity, which is a basic building block of a full scale CV quantum computation. Our proposal relies on preparation of a specific ancillary state and transferring its nonlinear properties onto the desired target by means of deterministic Gaussian operations and feed-forward. We show that, despite the imperfections arising from the deterministic nature of the operation, the weak quantum nonlinearity can be implemented and verified with the current level of technology.
@article{arxiv.1105.4950,
title = {Deterministic implementation of weak quantum cubic nonlinearity},
author = {Petr Marek and Radim Filip and Akira Furusawa},
journal= {arXiv preprint arXiv:1105.4950},
year = {2015}
}