We present a scheme for the amplification of Schrödinger 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.
Bibliographical note©2013 American Physical Society
Laghaout, A., Neergaard-Nielsen, J. S., Rigas, I., Kragh, C., Tipsmark, A., & Andersen, U. L. (2013). Amplification of realistic Schrödinger-cat-state-like states by homodyne heralding. Physical Review A, 87(4), 043826. https://doi.org/10.1103/PhysRevA.87.043826