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AIP conference proceedings

Detector imperfections in a recent scheme for Schrodinger-cat generation

Yuta Takahashi, Shinichi Komatsu, Shuichiro Inoue, Alexander I. Lvovsky

Published Jan 1, 2009• 0 citations
Publisher

Abstract

Nielsen and Mo/lmer have recently suggested a scheme transforming squeezed states into Schrödinger‐cat‐like states. Compared to previous schemes, this one is expected to generate cat‐like states with larger amplitudes. Here, we analyze their scheme with consideration of experimental imperfections.
DOI
10.1063/1.3131326

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Measurement-induced nonlinear operation in linear optics is a promising technique to realize quantum computation and communications. Such an operation has been demonstrated via the generation of photon-subtracted squeezed states, namely, Schrödinger-cat states. Nielsen and Mølmer have proposed an efficient scheme to generate the cat states with larger amplitudes relative to previous experimental results. We present a simple experimental implementation of their scheme and analyze it while considering experimental imperfections. Our study indicates that the current photon detection technology meets the conditions necessary for their operation.
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In this work, we investigate the generation of squeezed Schrödinger cat states in schemes based on photon-number-resolving measurements on multimode Gaussian states. We derive analytical expressions for the states generated in two- and three-mode schemes, as well as formulas for their fidelity with squeezed Schrödinger cat states. We analyze how the amplitude of the generated states scales with the number of detected particles. Furthermore, we derive an upper bound on the achievable generation fidelity and identify the conditions under which multimode schemes can enhance the quality of the generated states.