Articles written in Pramana – Journal of Physics

    • Long-lived quantum coherence in a two-level semiconductor quantum dot


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      In this paper, we present an analytical solution for the system of two-level semiconductor quantum dot. In addition, we discuss the rates of the photon radiative and phonon radiationless transitions fromthe excited state ($\alpha_{12}, \alpha_{21}$), the rate of processes of pure dephasing ($\gamma$ ), the detuning parameter ($\Delta$) and the Rabi frequency ($\Omega$), on the atomic occupation probabilities ($\rho_{11}(t)$ and $\rho_{22}(t)$), the atomic population inversion ($\rho_{z}(t)$), the purity ($P_{A}(t)$), the von Neumann entropy ($S(t)$) and the information entropies ($H(\sigma_{x}), H(\sigma_{y})$ and $H(\sigma_{z})$). We clearly observe the emergence of long-lived quantum coherence phenomenon in all the curves for some special cases of $\alpha_{12}, \alpha_{21}, \gamma, \Delta$ and $\Omega$. Besides, the decay phenomenon is quite evident in the purity curves, which can be simply controlled by changing the values of $\alpha_{12}, \alpha_{21}$ and $\gamma$.

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