Journal ArticleDOI
Externally induced continuous variable entanglement in a correlated emission laser
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TLDR
In this paper, an analysis of the externally induced quantum features of the cavity radiation of the two-photon correlated emission laser is presented, and it is shown that the pumping process induces atomic coherence responsible for observing entanglement in the cavity, as well as the nonclassical photon number correlation despite the arising vacuum fluctuations.Abstract:
Analysis of the externally induced quantum features of the cavity radiation of the two-photon correlated emission laser is presented. It turns out that the pumping process induces atomic coherence accountable for observing entanglement in the cavity radiation as well as the nonclassical photon number correlation despite the arising vacuum fluctuations. Even though a significant continuous variable entanglement is obtained near threshold in the strong driving limit, increasing the amplitude of the driving radiation more than required for a fixed value of the linear gain coefficient is found to degrade the degree of entanglement. The two-mode squeezing of the superimposed radiation, entanglement of the cavity radiation and mean number of photon pairs increase with the rate at which the atoms are injected into the cavity, but the nonclassical photon number correlation decreases. Moreover, the mean photon number corresponding to the transition from the upper energy level to the intermediate is found to be greater than the transition from the intermediate to the lower. With conceivable practical challenges, it is in principle possible to generate an intense continuous variable entanglement and quantify it via photon count measurements.read more
Citations
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Journal ArticleDOI
Role of dephasing in modifying the evolution of the cavity radiation of a coherent beat laser
TL;DR: In this article, a detailed derivation of the master equation and corresponding time evolution of the cavity radiation of coherent beat laser in terms of the $c$-number variables associated with the normal ordering is presented.
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Coherently driven degenerate three-level laser with parametric amplifier
TL;DR: In this paper, the authors considered the case in which the atoms injected into the cavity are prepared in a coherent superposition of the top and bottom levels and with these levels coupled by the pump mode emerging from the parametric amplifier.
Journal ArticleDOI
A comparative study of entanglement amplification in a nondegenerate three-level cascade laser employing various inseparability criteria
TL;DR: In this article, a detailed comparison among the exhibited nature of entanglement of the cavity radiation of the nondegenerate three-level cascade laser when different inseparability criteria are employed is presented.
Journal ArticleDOI
Continuous variable quantum discord in a correlated emission laser
TL;DR: In this paper, a detailed analysis of the nonclassical features of the cavity radiation of a non-degenerate correlated emission laser is presented, and a closed mathematical relation that describes the quantum discord in terms of the involved auto-and cross-correlations is provided.
Journal ArticleDOI
Role of phase fluctuation and dephasing in the enhancing continuous variable entanglement of a two-photon coherent beat laser
TL;DR: In this article, a steady state analysis of the nonclassical features and statistical properties of the cavity radiation of a two-photon coherent beat laser is presented, and it is shown that the degree of two-mode squeezing, detectable entanglement and intensity can increase with the deviation of the phase fluctuations of the laser employed in preparing the atoms, but decrease with the increasing rate at which the induced coherence superposition decays.
References
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Spin Squeezed Atoms: A Macroscopic Entangled Ensemble Created by Light
TL;DR: In this article, the experimental observation of a spin squeezed ensemble of cold atoms was reported, which was generated via quantum state transfer from nonclassical light to atoms, and was shown to be a macroscopic ensemble.
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Correlated Spontaneous Emission Laser as an Entanglement Amplifier
TL;DR: This work considers a two-photon correlated emission laser as a source of an entangled radiation with a large number of photons in each mode, and concludes that the creation of entangled states with photon numbers up to tens of thousands seems achievable.