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  • 2000-2004  (2)
  • PACS. 03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) – 03.67.Lx Quantum computation – 75.10.Jm Quantized spin models  (1)
  • PACS. 42.50.Dv Nonclassical field states; squeezed, antibunched, and sub-Poissonian states; operational definitions of the phase of the field; phase measurements - alytical methods  (1)
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  • 2000-2004  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    Nonclassical properties and algebraic characteristics of negative binomial states in quantized radiation fields (2000)
    Springer
    The European physical journal 10 (2000), S. 415-422 
    Details
    ISSN: 1434-6079
    Schlagwort(e): PACS. 42.50.Dv Nonclassical field states; squeezed, antibunched, and sub-Poissonian states; operational definitions of the phase of the field; phase measurements - alytical methods
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We study the nonclassical properties and algebraic characteristics of the negative binomial states introduced by Barnett recently. The ladder operator formalism and displacement operator formalism of the negative binomial states are found and the algebra involved turns out to be the SU(1,1) Lie algebra via the generalized Holstein-Primarkoff realization. These states are essentially Perelomov's SU(1,1) coherent states. We reveal their connection with the geometric states and find that they are excited geometric states. As intermediate states, they interpolate between the number states and geometric states. We also point out that they can be recognized as the nonlinear coherent states. Their nonclassical properties, such as sub-Poissonian distribution and squeezing effect are discussed. The quasiprobability distributions in phase space, namely the Q and Wigner functions, are studied in detail. We also propose two methods of generation of the negative binomial states. d 32.80.Pj Optical cooling of atoms; trapping
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100530050564
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  • 2
    Digitale Medien
    Digitale Medien
    Pairwise entanglement in symmetric multi-qubit systems (2002)
    Springer
    The European physical journal 18 (2002), S. 385-391 
    Details
    ISSN: 1434-6079
    Schlagwort(e): PACS. 03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) – 03.67.Lx Quantum computation – 75.10.Jm Quantized spin models
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: For pairs of particles extracted from a symmetric state of N two-level systems, the two-particle density matrix is expressed in terms of expectation values of collective spin operators for the large system. Results are presented for experimentally relevant examples of pure states: Dicke states | S, M〉, spin coherent, and spin squeezed states, where only the symmetric subspace, S = N/2 is populated, and for thermally entangled mixed states populating also lower S values. The entanglement of the extracted pair is then quantified by a calculation of the concurrence, which provides directly the entanglement of formation of the pair.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjd/e20020045
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