Measurement-induced decoherence and Gaussian smoothing of the Wigner distribution function

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We study the problem of measurement-induced decoherence using the phase-space approach employing the Gaussian-smoothed Wigner distribution function. Our investigation is based on the notion that measurement-induced decoherence is represented by the transition from the Wigner distribution to the Gaussian-smoothed Wigner distribution with the widths of the smoothing function identified as measurement errors. We also compare the smoothed Wigner distribution with the corresponding distribution resulting from the classical analysis. The distributions we computed are the phase-space distributions for simple one-dimensional dynamical systems such as a particle in a square-well potential and a particle moving under the influence of a step potential, and the time-frequency distributions for high-harmonic radiation emitted from an atom irradiated by short, intense laser pulses. (C) 2003 Elsevier Science (USA). All rights reserved.
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Issue Date
2003-10
Language
English
Article Type
Article
Keywords

ORDER HARMONIC-GENERATION; PHASE-SPACE; QUANTUM-MECHANICS; REPRESENTATIONS; TRAJECTORIES; IONIZATION; COHERENCE; DYNAMICS; PHYSICS; TERMS

Citation

ANNALS OF PHYSICS, v.307, pp.438 - 451

ISSN
0003-4916
URI
http://hdl.handle.net/10203/13792
Appears in Collection
PH-Journal Papers(저널논문)
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