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Tunneling-induced phase grating in quantum dot molecules.

Yongsheng Hu, Guangling Cheng, Aixi Chen

    Optics Express
    |October 29, 2020
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrate a new method to create phase gratings in quantum-dot molecules using interdot tunneling. This technique enhances nonlinear dispersion and allows for high-order light diffraction, with potential quantum optics applications.

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    Area of Science:

    • Quantum Optics
    • Solid-State Physics
    • Materials Science

    Background:

    • Quantum-dot molecules offer unique optical properties.
    • Controlling light-matter interactions is crucial for quantum technologies.
    • Phase gratings are essential optical components.

    Purpose of the Study:

    • To present an alternative scheme for phase grating preparation in quantum-dot molecules.
    • To investigate the role of interdot tunneling in enhancing nonlinear optical effects.
    • To explore the potential for high-order diffraction of weak probe light.

    Main Methods:

    • Utilizing tunnel coupling between two quantum dots.
    • Employing a standing-wave control field.
    • Analyzing the effects of interdot tunneling on linear and nonlinear absorption.

    Main Results:

    • Significantly enhanced nonlinear dispersion with nearly vanishing absorption due to tunneling-induced quantum coherence.
    • Diffraction of weak probe light into high-order directions.
    • Tunable diffraction intensity by adjusting driving intensity, detuning, tunneling strength, and interaction length.

    Conclusions:

    • The proposed scheme offers an easy and practical method for phase grating preparation.
    • The technique leverages weak standing-wave driving and weak tunneling strength.
    • Potential applications in quantum-optics and quantum-information-processing devices within solid-state systems.