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  • Electronic Resource  (4)
  • 2000-2004  (4)
  • 1975-1979
  • 2002  (2)
  • 2001  (2)
  • PACS. 05.40.-a Fluctuation phenomena, random processes, noise, and Brownian motion – 05.50.+q Lattice theory and statistics (Ising, Potts, etc.) – 75.50.Lk Spin glasses and other random magnets  (2)
  • PACS. 42.50.-p Quantum optics – 42.50.Dv Nonclassical field states; squeezed, antibunched, and sub-Poissonian states; operational definitions of the phase of the field; phase measurements  (2)
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  • Electronic Resource  (4)
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  • 2000-2004  (4)
  • 1975-1979
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  • 2002  (2)
  • 2001  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Low temperature properties of the random field Potts chain (2002)
    Springer
    The European physical journal 30 (2002), S. 357-367 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 05.40.-a Fluctuation phenomena, random processes, noise, and Brownian motion – 05.50.+q Lattice theory and statistics (Ising, Potts, etc.) – 75.50.Lk Spin glasses and other random magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The random field q-states Potts model is investigated using exact groundstates and finite-temperature transfer matrix calculations. It is found that the domain structure and the Zeeman energy of the domains resembles for general q the random field Ising case (q = 2). This is also the expected outcome based on a random-walk picture of the groundstate. The domain size distribution is exponential, and the scaling of the average domain size with the disorder strength is similar for q arbitrary. The zero-temperature properties are compared to the equilibrium spin states at small temperatures, to investigate the effect of local random field fluctuations that imply locally degenerate regions. The response to field perturbations (`chaos') and the susceptibility are investigated. In particular for the chaos exponent it is found to be 1 for q = 2,..., 5. Finally for q = 2 (Ising case) the domain length distribution is studied for correlated random fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00390-7
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A single atom-based generation of Bell states of two cavities (2002)
    Springer
    The European physical journal 18 (2002), S. 379-383 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 42.50.-p Quantum optics – 42.50.Dv Nonclassical field states; squeezed, antibunched, and sub-Poissonian states; operational definitions of the phase of the field; phase measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A new conditional scheme for generating Bell states of two spatially separated high-Q cavities is reported. Our method is based on the passage of one atom only through the two cavities. A distinctive feature of our treatment is that it incorporates from the very beginning the unavoidable presence of fluctuations in the atom-cavity interaction times. The possibility of successfully implementing our proposal against cavity losses and atomic spontaneous decay is carefully discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjd/e20020044
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ground states versus low-temperature equilibria in random field Ising chains (2001)
    Springer
    The European physical journal 24 (2001), S. 101-105 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 05.40.-a Fluctuation phenomena, random processes, noise, and Brownian motion – 05.50.+q Lattice theory and statistics (Ising, Potts, etc.) – 75.50.Lk Spin glasses and other random magnets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Random walk arguments and exact numerical computations are used to study one-dimensional random field chains. The ground state structure is described with absorbing and non-absorbing random walk excursions. At low temperatures, the local magnetization follows the ground state except at regions where a local random field fluctuation makes thermal excitations easier. This is explained by the random walk picture, implying that the magnetization lengthscale is a product of the domain size and the thermal excitation scale.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170027
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Statistical properties of a solvable three-boson squeeze operator model (2001)
    Springer
    The European physical journal 13 (2001), S. 423-438 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 42.50.-p Quantum optics – 42.50.Dv Nonclassical field states; squeezed, antibunched, and sub-Poissonian states; operational definitions of the phase of the field; phase measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: In the present paper we introduce a new squeeze operator, which is related to the time-dependent evolution operator for Hamiltonian representing mutual interaction between three different modes. Squeezing phenomenon as well as the variances of the photon-number sum and difference are considered. Moreover, Glauber second-order correlation function is discussed, besides the quasiprobability distribution function and phase distribution for different states. The joint photon-number distribution is also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530170261
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    Paper (German National Licenses)
    Fulltext
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