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Journal Article

Amplification of realistic Schrodinger-cat-state-like states by homodyne heralding


Andersen,  Ulrik L.
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Laghaout, A., Neergaard-Nielsen, J. S., Rigas, I., Kragh, C., Tipsmark, A., & Andersen, U. L. (2013). Amplification of realistic Schrodinger-cat-state-like states by homodyne heralding. PHYSICAL REVIEW A, 87(4): 043826. doi:10.1103/PhysRevA.87.043826.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6789-8
We present a scheme for the amplification of Schrodinger 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. DOI: 10.1103/PhysRevA.87.043826