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  • 1
    Electronic Resource
    Electronic Resource
    Optical pumping of velocity-selective coherent population trapping states in three-level atoms (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 280-287 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An analytical theory of optical pumping of velocity-selective coherent population trapping states in three-level Λ-atoms is presented. The theory is based on an atomic density matrix in the superpositional state representation. The representation introduced for the atomic density matrix directly describes coherent population trapping (CPT) states in a three-level Λ-atom and yields an approximate analytical description for the shape of the two-peak momentum (velocity) distribution of atoms. Optical pumping of velocity-selective CPT states is described in the superpositional state representation as a process of redistribution of atoms in the region of small velocities due to the photon recoil. Typical times of formation of velocity-selective CPT states are found to be inversely proportional to the square of the recoil energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558657
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Tensor structure of the stationary point of the radiative relaxation operator of an atom (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 70-75 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We formulate the problem of the stationary point of the operator of radiative relaxation of an atom: the initial distribution among the sublevels of the excited state, whose nonzero eigenvalues (populations) coincide with the populations of the final distribution (after spontaneous decay) among the sublevels of the ground state. We show that these distributions can be expressed in terms of spherical functions of the complex direction. The results are then used to develop a compact analytical representation of the stationary density matrix of atoms interacting with an elliptically polarized monochromatic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558627
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Quantum-state diffusion with adaptive noise (1998)
    Springer
    The European physical journal 2 (1998), S. 175-180 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 42.50.Lc Quantum fluctuations, quantum noise, and quantum jumps - 32.80.-t Photon interactions with atoms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We present a scheme for stochastic quantum-state diffusion (QSD) with adaptive noise to calculate the time evolution of an arbitrary observable of an open system. The method is based on the fact that the observable is much less sensitive to adaptive noise than to noise with a random phase. Hence, the individual realisations of the expectation value of the observable stay closer to the average evolution and fewer realisations are required to obtain the ensemble average. This is illustrated by applying QSD to a driven two-level system using both randomly phased and adaptive noise. Applying QSD with adaptive noise to an undriven two-level system enables us to derive a deterministic Schrödinger equation that produces the exact evolution of an arbitrary observable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050127
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    Paper (German National Licenses)
    Fulltext
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