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Strongly-Entangled Twin Beams Produced by a Coherent Beat Laser Coupled to Thermal Reservoir

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Journal of Russian Laser Research Aims and scope

Abstract

Applying the combination of the master and stochastic differential equations, we investigate in detail a continuous-variable entanglement of the twin beam generated by the coherent beat laser containing a parametric amplifier and coupled to thermal light of an external environment. The dipole-forbidden transition of the three-level atoms are coupled by the initial coherent superposition and classical pumping light emerging from the parametric oscillator. The atomic coherence induced by the classical pumping field and the initial coherent superposition induce a strong correlation between the two-mode radiation, which results in a high degree of the photon entanglement. In addition, the parametric amplifier enhances the achievable degree of entanglement of the two-mode fields. On the other hand, thermal light appears to degrade entanglement but a strong photon entanglement can be generated by managing the amount of thermal noise entering into the laser cavity through the output mirror.

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Authors and Affiliations

  1. Department of Physics, Jimma University, P.O. Box 378, Jimma, Ethiopia

    Chimdessa Gashu Feyisa, Tamirat Abebe, Teklemariam Tessema, Ebisa Mosisa, Abebe Tuguma, Jiregna Amsalu, Adimasu Worku & Gemechu Feyisa

  2. Department of Electronics and Communicatios, Adama Sciences and Technology, P.O. Box 1888, Adama, Ethiopia

    Demissie Jobir

  3. Department of Physics, Aksum University, P.O. Box 1010, Axum, Ethiopia

    Mekonnen Molla

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  1. Chimdessa Gashu Feyisa
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  2. Tamirat Abebe
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  3. Teklemariam Tessema
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  4. Ebisa Mosisa
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  8. Gemechu Feyisa
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  9. Demissie Jobir
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Correspondence to Chimdessa Gashu Feyisa.

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Feyisa, C.G., Abebe, T., Tessema, T. et al. Strongly-Entangled Twin Beams Produced by a Coherent Beat Laser Coupled to Thermal Reservoir. J Russ Laser Res 42, 1–19 (2021). https://doi.org/10.1007/s10946-020-09924-3

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  • DOI: https://doi.org/10.1007/s10946-020-09924-3

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