12,585 research outputs found
Determination of pseudo-Goldstone boson-photon coupling by the differential time delay of pulsar signals
Pseudo-Goldstone bosons couple with photons through a P and T violating
interaction of the form . Strong
magnetic fields in rotating compact stars induce a non-zero outside the stellar surface which acts as a source for the pseudo-scalar
field. Pulsar signals propagating through this pseudo-scalar `hair' suffer a
differential time lag between the left and the right circularly polarised modes
because of the P and T violating pseudoscalar boson-photon interaction.
Determination of this time lag upto a microsecond accuracy can lead to a
measurment of (or rule out) pseudo-Goldstone boson-photon coupling upto .Comment: Plain TeX,12 pages,IP/BBSR/92-9
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
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