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The Institute of Physics ( IOP ) по журналам "Journal of Optics B: Quantum and Semiclassical Optics"

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  • Martin Holthaus (2000-10-01)
    We study the dynamics of ultracold atoms in an optical lattice under constant bias. After recapitulating the ideas underlying Bloch oscillations and Zener's formula for interband transitions, the Bloch-Zener scenario is ...
  • Chiara Macchiavello (2000-04-01)
    We analyse the efficiency of quantum cloning for qubits. We investigate, in particular, the role played by the form of allowed input states and show how the fidelity of cloning changes by restricting the class of inputs.
  • M S Torre; C Masoller; N B Abraham; H F Ranea-Sandoval (2000-10-01)
    We analyse the dynamics of a weakly index-guided semiconductor laser operating near threshold and with optical feedback, using the Lang-Kobayashi model. Lateral effects are included, taking into account lateral carrier ...
  • R J Kasumova (2000-06-01)
    A theory of intracavity fourth-harmonic generation has been developed in the constant intensity approximation with account of changes in the interacting wave phases. The effect both of the phase mismatch and of the absorption ...
  • H Eleuch; J M Courty; G Messin; C Fabre; E Giacobino (1999-02-01)
    A theoretical investigation of cavity QED effects in semiconductor microcavities containing quantum wells is presented. A model Hamiltonian is used to derive equations of motion for the quantum photon and exciton fields ...
  • T C Ralph; P K Lam; R E S Polkinghorne (1999-08-01)
    We discuss the characterization of continuous variable, optical quantum teleportation in terms of the two-quadrature signal transfer and conditional variances between the input and output states. We derive criteria which ...
  • V N Chizhevsky (2000-12-01)
    The phase space of a loss-modulated CO2 laser is experimentally investigated with the use of the technique of short-lived pulse loss perturbations. A coexistence of two and three attractors is shown in a wide range of the ...
  • Suc-Kyoung Hong; Chung-In Um; Kyu-Hwang Yeon; Duk-Hyeon Kim (1999-10-01)
    The characteristics of the quantum optical complementarity principle and the coherence of the photons generated in a Mach-Zehnder interferometer with two degenerate optical parametric amplifiers are analysed. The photon ...
  • Jean-Pierre Amiet; Stefan Weigert (1999-10-01)
    Coherent states provide an appealing method to reconstruct efficiently the pure state of a quantum mechanical spin s. A Stern-Gerlach apparatus is used to measure (4s+1) expectations of projection operators on appropriate ...
  • V Sunilkumar; B A Bambah; R Jagannathan; P K Panigrahi; V Srinivasan (2000-04-01)
    We present a general unified approach for finding the coherent states (CSs) of polynomially deformed algebras such as the quadratic and Higgs algebras, which are relevant for various multiphoton processes in quantum optics. ...
  • Y Ben-Aryeh (1999-04-01)
    The quantum field theory for the one-dimensional Schrödinger equation with attractive delta function potentials is used for treating the dynamics of collisions between a small number of photons in a nonlinear Kerr medium. ...
  • A Miranowicz; J Bajer; H Matsueda; M R B Wahiddin; R Tanas (1999-10-01)
    Two standard criteria of the photon antibunching for non-stationary fields are compared. A new criterion, obtained by direct application of the Cauchy-Schwarz inequality, is proposed. All three definitions, based on the ...
  • A Miranowicz; H Matsueda; J Bajer; M R B Wahiddin; R Tanas (1999-10-01)
    Previous work on the two-time photon-number correlations of quantum non-stationary fields has focused on the demonstration of self-contradictory predictions of the photon antibunching according to different definitions. ...
  • J Clausen; M Dakna; L Knll; D G Welsch (1999-06-01)
    Using conditional measurement on a beam splitter, we study the transformation of the quantum state of the signal mode within the concept of two-port non-unitary transformation. Allowing for arbitrary quantum states of both ...
  • I Ashraf; A H Toor (2000-12-01)
    We have developed a quantum theory of the micromaser for a pair of two-level atoms for the case of one- and two-photon transition coupling. We have studied the effect of co-operativity on the photon statistics for these ...
  • V Berardi; A Garuccio; V L Lepore (2000-08-01)
    In this paper we derive a general approach using correlation functions for interpreting the results of measurements on two-particle entangled states. In our analysis we explicitly take into account the detector efficiency. ...
  • Masashi Ban; Keiko Kurokawa; Osamu Hirota (1999-04-01)
    The cut-off rate performance of quantum communication channels is considered when the signal quantum states are pure and symmetric. The properties of the quantum cut-off rate which is obtained by the entangled measurement ...
  • V V Dodonov; S S Mizrahi; A L de Souza Silva; S S Mizrahi (2000-06-01)
    We introduce the quantitative measures characterizing the rates of decoherence and thermalization of quantum systems. We study the time evolution of these measures in the case of a quantum harmonic oscillator whose relaxation ...
  • S M Dutra; G Nienhuis (2000-10-01)
    We present a rigorous first principles derivation of the heuristic approach behind most of cavity QED: the quantization of the field in a high-Q cavity as if the mirrors were perfect with losses modelled by a coupling ...
  • Hong-yi Fan; Alfred Wünsche (2000-08-01)
    The design of squeezing by a time-dependent harmonic oscillator is considered. The predetermined general time-dependent squeezing transformations are taken as the starting point from which the time evolution operator U(t,0) ...