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- W2068596985 abstract "Characteristic functions contain complete information about all the moments of a classical distribution and the same holds for the Fourier transform of the Wigner function: a quantum characteristic function, or the chord function. However, knowledge of a finite number of moments does not allow for accurate determination of the chord function. For pure states this provides the overlap of the state with all its possible rigid translations (or displacements). We here present a semiclassical approximation of the chord function for large Bohr-quantized states, which is accurate right up to a caustic, beyond which the chord function becomes evanescent. It is verified to pick out blind spots, which are displacements for zero overlaps. These occur even for translations within a Planck area of the origin. We derive a simple approximation for the closest blind spots, depending on the Schroedinger covariance matrix, which is verified for Bohr-quantized states." @default.
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- W2068596985 date "2010-04-30" @default.
- W2068596985 modified "2023-10-18" @default.
- W2068596985 title "Semiclassical theory for small displacements" @default.
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- W2068596985 doi "https://doi.org/10.1088/1751-8113/43/20/205302" @default.
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