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    Area of Science:

    • Quantum optics
    • Atomic physics
    • Spectroscopy

    Background:

    • Electromagnetically induced transparency (EIT) is a quantum interference effect.
    • Rydberg states, highly excited atomic states, have unique properties.
    • Accessing Rydberg states with high angular momentum is challenging.

    Purpose of the Study:

    • To demonstrate EIT in a four-level cascade-like system using Rydberg states.
    • To utilize a microwave field for coupling and inducing transparency.
    • To explore the potential for studying exotic Rydberg molecular states.

    Main Methods:

    • Utilizing a four-level cascade-like atomic system.
    • Employing a two-photon transition with off-resonant microwave and optical fields.
    • Characterizing the Rabi frequency of the effective coupling field and EIT microwave spectra.

    Main Results:

    • Successfully demonstrated EIT in the Rydberg system.
    • Characterized the effective coupling field's Rabi frequency.
    • Observed EIT microwave spectra.

    Conclusions:

    • Microwave-assisted EIT provides an efficient method to access Rydberg states.
    • This technique enables probing of Rydberg states with high orbital angular momentum (ℓ=3).
    • The findings are promising for investigating exotic Rydberg molecular states.