Amplification of realistic Schrödinger-cat-state-like states by homodyne heralding
Amine Laghaout, Jonas Schou Neergaard-Nielsen, Ioannes Rigas, C. Kragh, Anders Tipsmark, Ulrik L. Andersen · Physical Review A · 2013
We present a scheme for the amplification of Schr\"odinger cat states that collapses two smaller states onto their constructive interference via a homodyne projection. We analyze the performance of the amplification in terms of fidelity and success rate when the input consists of either exact coherent state superpositions or of photon-subtracted squeezed vacua. The impact of imprecise homodyne detection and of impure squeezing is quantified. We also assess the scalability of iterated amplifications.