We propose and demonstrate an effective mode-filtering technique of non-Gaussian states generated by photon-subtraction. More robust non-Gaussian states have been obtained by removing noisy low frequencies from the original mode spectrum. We show that non-Gaussian states preserve their non-classicality after quantum teleportation to a higher degree, when they have been mode-filtered. This is indicated by a stronger negativity −0.033±0.005 of the Wigner function at the origin, compared to −0.018±0.007 for states that have not been mode-filtered. This technique can be straightforwardly applied to various kinds of photon-subtraction protocols, and can be a key ingredient in a variety of applications of non-Gaussian states, especially teleportation-based protocols towards universal quantum information processing.
@article{arxiv.1202.2418,
title = {Quantum mode filtering of non-Gaussian states for teleportation-based quantum information processing},
author = {Shuntaro Takeda and Hugo Benichi and Takahiro Mizuta and Noriyuki Lee and Jun-ichi Yoshikawa and Akira Furusawa},
journal= {arXiv preprint arXiv:1202.2418},
year = {2013}
}