Generating Grid States From Schr\"odinger Cat States without Post-Selection

Understand

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.