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Atomic coherence
About: Atomic coherence is a research topic. Over the lifetime, 877 publications have been published within this topic receiving 29395 citations.
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TL;DR: In this article, the steady optical properties of triple quantum dots, which obtain a tunneling-induced effect by using the external electric field, were investigated and it was shown that the electromagnetically induced transparency can be achieved via the tunneling induced effect.
Abstract: We investigated the steady optical properties of the triple quantum dots, which obtain a tunneling-induced effect by using the external electric field. Our numerical results shown that the electromagnetically induced transparency can be achieved via the tunneling-induced effect. In addition, we examined the propagation dynamics of a probe field in this system and found that the probe field group velocities and their absorption were related to the tunneling coupling intensities. This finding allowed us to control the probe field to obtain ultraslow group velocities and a tunable optical switch. Finally, using this scheme it was possible to store and release the probe field by modulating the tunneling coupling sequences.
TL;DR: In this article, a scheme to realize the quantum random walk in a coherent five-level atomic system via electromagnetically induced transparency (EIT) was proposed, where two circular-polarized components of a probe field display different dispersion properties and acquire different phase-shift modifications when passing through atomic cells.
Abstract: We propose a scheme to realize the quantum random walk in a coherent five-level atomic system via electromagnetically induced transparency (EIT). From optical Bloch equations describing the dynamics of the electromagnetic field and atomic population and coherence, we show that two circular-polarized components of a probe field display different dispersion properties and hence acquire different phase-shift modifications when passing through atomic cells. We demonstrate that the quantum coherence and interference owing to the EIT effect result in a low absorption of the probe field and hence provide a possibility of realizing a many-step phase-shift quantum random walk. The scheme may be used to experimentally highlight the characteristics of quantum random walk and lead to a promising application for quantum computation.
TL;DR: In this article, population transfer and excitation of quantum coherence in atomic and nuclear systems interacting with strong ultra-short laser pulses are studied and possible applications to cooperative generation of XUV and nuclear radiation are discussed.
Abstract: We study population transfer and excitation of quantum coherence in atomic and nuclear systems interacting with strong ultra-short laser pulses. We discuss CEP effects and possible applications to cooperative generation of XUV and nuclear radiation.
TL;DR: In this paper, high contrast Raman Ramsey fringes in atomic vapor medium using time delayed optical pulse pairs were observed using a time-delayed optical pulse pair with a Raman resonance detector.
Abstract: We report observation of high contrast Raman Ramsey fringes in atomic vapor medium using time delayed optical pulse pairs.
TL;DR: In this paper, the localization of the four-level V-type atom inside a classical standing-wave field through the absorption spectrum of the weak probe field is derived analytically via perturbation treatment.
Abstract: We investigate the localization of the four-level V-type atom inside a classical standing-wave field through the absorption spectrum of the weak probe field. The expression of the probe absorption spectrum is derived analytically via perturbation treatment of a weak probe field. Numerical results and discussion of the probe susceptibility spectrum behaviour via non-perturbation treatment of the density matrix elements to all orders of fields are obtained. We have shown that the precision of localization of the atom is dependent on the dephasing rates of atomic coherence as well as on some parameters of the driving and standing-wave fields. A strong localization through sharply peak is achieved at a certain value for the dephasing rates in resonance detunings.
Key words: Quantum optics, atomic system, atom localization.