12,103 research outputs found
Aspects of nonlocality in atom-photon interactions in a cavity
We investigate a Bell-type inequality for probabilities of detected atoms
formulated using atom-photon interactions in a cavity. We consider decoherence
brought about by both atomic decay, as well as cavity photon loss, and study
its quantitative action in diminishing the atom-field and the resultant
atom-atom secondary correlations. We show that the effects of decoherence on
nonlocality can be observed in a controlled manner in actual experiments
involving the micromaser and also the microlaser.Comment: 9 pages, 3 .eps figures, Revtex. Revised version with details of
calculations and more result
Broadcasting of continuous variable entanglement
We present a scheme for broadcasting of continuous variable entanglement. We
show how an initial two-mode squeezed state of the electromagnetic field shared
by two distant parties can be broadcasted into two nonlocal bipartite entangled
states. Our protocol uses a local linear amplifier and a beam splitter at each
end. We compute the fidelity of the output entangled states and show that the
broadcasting can be implemented for a variety of input squeezed states and
amplifier phases.Comment: 4 pages, 2 eps figures, RevTe
Entanglement measurement with discrete multiple coin quantum walks
Within a special multi-coin quantum walk scheme we analyze the effect of the
entanglement of the initial coin state. For states with a special entanglement
structure it is shown that this entanglement can be meausured with the mean
value of the walk, which depends on the i-concurrence of the initial coin
state. Further on the entanglement evolution is investigated and it is shown
that the symmetry of the probability distribution is reflected by the symmetry
of the entanglement distribution.Comment: 9 pages, IOP styl
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