1,334 research outputs found
Geometric Discord Of the Jaynes-Cummings Model: Pure Dephasing Regime
In this paper, the dynamical behaviour of the geometric discord of a system
consisting of a two-level atom interacting with a quantised radiation field
described by the Jaynes-Cummings model has been studied. The evolution of the
system has been considered in the pure dephasing regime when the field is
initially in a general pure state and the atom is initially in a mixed state.
Dynamics of the geometric discord, as a measure of non-classical correlation,
has been compared with the dynamics of negativity, as a measure of quantum
entanglement. In particular, the influence of different parameters of system
such as detuning and mixedness of the initial atomic state on the dynamics of
geometric discord has been evaluated for when the field is initially in
coherent and number states. It is shown that for asymptotically large times,
the steady state geometric discord of the system presents a non-zero optimum
value at some intermediate value of detuning.Comment: 21 pages, 7 figures. appears in Eur. Phys. J. D 201
The effect of etchants on surface of CdTe single crystal
Cadmium telluride crystals (CdTe) have been grown by the sublimation method. The crystal polarity of the CdTe with the zincblend structure has been studied. Two different crystallographic defect and etch pits are revealed on the (111) Cd and Te surfaces by different etchant
The effect of spin-orbit interaction on entanglement of two-qubit Heisenberg XYZ systems in an inhomogeneous magnetic field
The role of spin-orbit interaction on the ground state and thermal
entanglement of a Heisenberg XYZ two-qubit system in the presence of an
inhomogeneous magnetic field is investigated. For a certain value of spin-orbit
parameter , the ground state entanglement tends to vanish suddenly and when
crosses its critical value , the entanglement undergoes a revival. The
maximum value of the entanglement occurs in the revival region. In finite
temperatures there are revival regions in plane. In these regions,
entanglement first increases with increasing temperature and then decreases and
ultimately vanishes for temperatures above a critical value. This critical
temperature is an increasing function of , thus the nonzero entanglement can
exist for larger temperatures. In addition, the amount of entanglement in the
revival region depends on the spin-orbit parameter. Also, the entanglement
teleportation via the quantum channel constructed by the above system is
investigated and finally the influence of the spin-orbit interaction on the
fidelity of teleportation and entanglement of replica state is studied.Comment: Two columns, 9 pages, 8 Fig
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