| CLASSICAL AREAS OF PHENOMENOLOGY |
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Role of phase fluctuation and dephasing in the enhancing continuous variable entanglement of a two-photon coherent beat laser |
| Sintayehu Tesfa† |
| Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, 01187 Dresden, Germany; Physics Department, Dilla University, P. O. Box 419, Dilla, Ethiopia |
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Abstract A steady state analysis of the nonclassical features and statistical properties of the cavity radiation of a two-photon coherent beat laser is presented. Results show that the degree of two-mode squeezing, detectable entanglement and intensity of the cavity radiation 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. Although it is found that varying the phase fluctuations and dephasing can lead to modification in the quantum features and statistical properties of the radiation, it does not alter the similarity in the nature of the degree of entanglement detectable by the criteria following from Duan-Giedke-Cirac-Zoller and logarithmic negativity in a perceivable manner. Since the intensity and quantum features can be readily enhanced, this system is expected to be a viable source of a strong robust entangled (squeezed) light under various conditions. Moreover, comparison of the mean number of photon pairs with intensity difference shows that the chance of inciting a two-photon process can be enhanced by changing the rate of dephasing and phase fluctuations.
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Received: 23 April 2011
Revised: 29 August 2011
Accepted manuscript online:
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PACS:
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42.50.Ar
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42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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42.50.Lc
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(Quantum fluctuations, quantum noise, and quantum jumps)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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Cite this article:
Sintayehu Tesfa Role of phase fluctuation and dephasing in the enhancing continuous variable entanglement of a two-photon coherent beat laser 2012 Chin. Phys. B 21 014204
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