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• W2000568708 abstract "Within the framework of a unified approach, we derive several identical representations of the realistic (and ideal) pattern functions ${f}_{k,l}$ necessary to reconstruct the density-matrix element ${ensuremath{varrho}}_{mathrm{kl}}$ in the Fock basis from realistic quadrature distributions measured with a nonideal balanced homodyne detector of overall efficiency $ensuremath{eta}.$ To this end we first establish a biorthogonality relation for the pattern functions from which the form of the Fourier-transformed pattern functions can be easily read off. Then a different handling of the inverse Fourier transform yields several identical representations for the desired pattern functions provided that $ensuremath{eta}>1/2.$ In particular, we derive a representation of the realistic pattern functions in terms of a finite weighted sum over scaled ideal ones. Compared to a previously given form, this expression has a nice analytical structure, reveals some general features of the realistic pattern functions, and is particularly well suited for their numerical computation. From this representation sum relations for the pattern functions follow. With their help we show that both a smoothed Wigner function and a generalized moment generating function can be directly sampled from realistic quadrature distributions. The corresponding sampling functions are basically shifted and/or scaled versions of the ideal pattern functions ${f}_{0,0}$ and ${f}_{0,k},$ respectively. As a by-product we derive the sampling functions needed to reconstruct the density matrix from the Fourier-transformed realistic quadrature distribution, i.e., from the s-ordered characteristic function with $s=ensuremath{-}(1ensuremath{-}ensuremath{eta})/ensuremath{eta}.$" @default.
• W2000568708 created "2016-06-24" @default.
• W2000568708 creator A5057727949 @default.
• W2000568708 date "2000-05-17" @default.
• W2000568708 modified "2023-09-25" @default.
• W2000568708 title "Realistic pattern functions for optical homodyne tomography and determination of specific expectation values" @default.
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• W2000568708 doi "https://doi.org/10.1103/physreva.61.063819" @default.
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