Grid (or comb) states are an interesting class of bosonic states introduced by Gottesman, Kitaev and Preskill to encode a qubit into an oscillator. A method to generate or `breed' a grid state from Schr\"odinger cat states using beam splitters and homodyne measurements is known, but this method requires post-selection. In this paper we show how post-processing of the measurement data can be used to entirely remove the need for post-selection, making the scheme much more viable. We bound the asymptotic behavior of the breeding procedure and demonstrate the efficacy of the method numerically.
Cite
@article{arxiv.1709.08580,
title = {Generating Grid States From Schr\"odinger Cat States without Post-Selection},
author = {Daniel J. Weigand and Barbara M. Terhal},
journal= {arXiv preprint arXiv:1709.08580},
year = {2018}
}