We present an analytical expression for the response of a transient spectrum to a single-Cooper-pair box biased by a classical voltage and irradiated by a single-mode quantized field. The exact solution of the model is obtained, by means of which we analyze the analytic form of the fluorescence spectrum using the transitions among the dressed states of the system. An ... إقراء المزيد

We explore and develop the mathematics of the theory of a class encompassing several widely encountered models of a solid-state quantum structure which is capable of generating maximally entangled states, such as Bell-states and Greenberger–Horne–Zeilinger (GHZ) states. This analytical treatment not only provides an unified formulation to the models belonging to the class considered but is found to uncover several ... إقراء المزيد

We study the uncertainty relations between photon number and canonical phase of a multilevel system. All the relevant quantities can be sampled directly from the measured phase-dependent quadrature distribution. Some comments are made on the extension of these relations to the case where the Hilbert space is of infinite dimension. We describe its theoretical basis and discuss its practical relevance, ... إقراء المزيد

Based on exact quantum dynamics of a single four-level atom strongly coupled to a cavity field mode and driven by a coherent laser field, we investigate quantum mutual entropy as a measure of the amount of total correlations. Through the analysis of the dynamic of the total correlation, we show that under the influence of the decoherence, the total correlation ... إقراء المزيد

In this letter we present a scheme for generating maximally entangled states of two cavity modes which enables us to generate complete set of Bell basis states having rather simple initial state preparation. Furthermore, we study the interaction of a two-level atom with two modes of electromagnetic field in a high Q cavity. The two-level atom acts as a control ... إقراء المزيد

The behavior of a modified Jaynes-Cummings Hamiltonian model (two-level atom in interaction with an electromagnetic field) in the presence of degenerate parametric amplification is introduced. We have examined two different cases, one when the field frequency ω is not equal to the splitting photon frequency ε for which the off-resonance case is considered. In the second case we have taken ... إقراء المزيد

We derive an explicit formula for the quantum mutual entropy as a measure of the total correlations in a multi-level atom interacting with a cavity field. We describe its theoretical basis and discuss its practical relevance. The effect of the number of levels involved on the quantum mutual entropy is demonstrated via examples of three-, four- and five-level atom. Numerical ... إقراء المزيد

* Metwally and _M. Abdel-Aty_, Entanglement and information transfer between two qubits Physica A: Statistical Mechanics and its Application(2007) إقراء المزيد

In this contribution a nonlinear type of the correlated two-mode states (nonlinear pair-coherent states (NLPCS)) is introduced. Based on the resonant ion–cavity interaction, we propose a scheme to generate these states revealing their connection with the pair-coherent state (PCS) and investigate their nonclassical properties. The practical feasibility of this method is also discussed. The _s_-parameterized characteristic function (CF) of the ... إقراء المزيد

The first harmonic components of the absorption/dispersion spectrum, the intensity and Boltzmann-Gibbs entropy are investigated within a truncated continued fraction approach for the non-autonomous system of ordinary differential equations modelling a coherently driven 2-level atom bathed in a broadband squeezed vacuum. For the given data, regions of amplification, steep variational dispersion are identified. The Boltzmann-Gibbs entropy shows dense (less dense) ... إقراء المزيد