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Measuring nonclasicality of single-mode ...
Tasgin, Mehmet Emre...

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Measuring nonclasicality of single-mode systems by Tasgin, Mehmet Emre ( Author )
Lemonjar Open Access
N.A
03-02-2015
A beam splitter can generate entanglement if the input field is nonclassical, e.g. squeezed. Thus, beam splitter transformation can be utilized for obtaining single-mode nonclassicality conditions from two-mode entanglement criteria. Here, we demonstrate that (i) the generalized quadrature-squeezing condition ⟨a^†a^⟩<|⟨a^2⟩| can be obtained from the two-mode entanglement criterion of Duan-Giedke-Cirac-Zoller~[PRL 84, 2722]. (ii) Single-mode nonclassicality condition, obtained from the two-mode entanglement criterion of Simon~[PRL, 84 2726], can detect (also accompanies) the nonclassicality of a superradiant ground state where no quadrature-squeezing takes place. (iii) We present an explicit form for a single-mode nonclassicality measure, for Gaussian states, via maximization of the beam splitter output with respect to the beam splitter parameters. We measure the nonclassicality of a squeezed state and the one generated by a damped second harmonic crystal cavity. We determine pump strengths where single-mode nonclassicality onsets, i.e. resists against the vacuum noise.
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Article
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36.88 KB
English
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MYR 0.01
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https://arxiv.org/abs/1502.00992
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