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Rydberg atom-based AM receiver with a weak continuous frequency carrier.

Huaqiang Li, Jinlian Hu, Jingxu Bai

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    Summary
    This summary is machine-generated.

    This study presents a novel atom-based receiver for digital communication, utilizing Rydberg electromagnetically induced transparency (EIT) to achieve a wide 0.1-5 GHz operating frequency. The system demonstrates high sensitivity and broad bandwidth for practical quantum communication applications.

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    Area of Science:

    • Quantum Optics
    • Atomic Physics
    • Optical Communications

    Background:

    • Traditional atomic receivers often require operation near resonant frequencies, limiting their bandwidth and practical application.
    • The Rydberg AC Stark effect offers a tunable mechanism for manipulating atomic energy levels.

    Purpose of the Study:

    • To develop and demonstrate an atom-based amplitude-modulation (AM) receiver for digital communication.
    • To achieve a wide and continuously tunable operating carrier frequency using Rydberg states.
    • To overcome the frequency limitations of existing EIT-based atomic receivers.

    Main Methods:

    • Utilizing the Rydberg AC Stark effect in a vapor cell with a strong local oscillator (LO) field and a weak carrier field (ECarr).
    • Encoding digital baseband signals onto the carrier field via amplitude modulation.
    • Probing the Rydberg atom's response using Rydberg electromagnetically induced transparency (EIT).

    Main Results:

    • Achieved a continuously tunable operating carrier frequency from 0.1 GHz to 5 GHz at a single Rydberg state.
    • Measured an instantaneous bandwidth of approximately 230 kHz.
    • Demonstrated practical communication with a color image, achieving a maximum data transfer rate of 238 kbps and a bit error rate (BER) below 5% for ECarr ≥ 13.52 μV/cm.

    Conclusions:

    • The developed atom-based AM receiver overcomes previous frequency limitations, enabling practical quantum communication.
    • The system exhibits high sensitivity and broad bandwidth, making Rydberg EIT technology closer to real-world applications.
    • This work paves the way for sensitive, wide-bandwidth atomic receivers operating across a broad frequency range.