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Rydberg-atom-based digital communication using a continuously tunable radio-frequency carrier.

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    This study demonstrates reliable digital communication using Rydberg atoms as a quantum antenna, achieving 500 kbps over a 200 MHz bandwidth near a 10.22 GHz carrier. This advances atomic RF receiver technology for broadband communication and sensing.

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    Area of Science:

    • Quantum Optics
    • Atomic Physics
    • Radio-Frequency Engineering

    Background:

    • Electromagnetically-induced transparency (EIT) in Rydberg atoms enables high-sensitivity radio-frequency (RF) electric field measurements.
    • Existing atomic RF receivers operate optimally at resonance between Rydberg states.

    Purpose of the Study:

    • To investigate the feasibility of digital communication using Rydberg atoms as a quantum antenna operating off-resonance.
    • To explore the performance of this quantum-based antenna over a tunable RF carrier frequency.

    Main Methods:

    • Utilized electromagnetically-induced transparency (EIT) in Rydberg atoms.
    • Detected optical power changes of a probe laser to retrieve the time-varying RF field.
    • Analyzed RF reception quality by varying RF detuning and employing linear gain response to suppress distortion.

    Main Results:

    • Achieved reliable digital communication at 500 kbps within a 200 MHz bandwidth near a 10.22 GHz carrier.
    • Observed increased bit error rate (BER) outside this range, reaching 15% at ±150 MHz RF detuning.
    • Demonstrated signal decoding at speeds up to 500 kHz within the tunable bandwidth.

    Conclusions:

    • Confirms the physical basis for reliable broadband RF communication and spectral sensing using Rydberg atoms.
    • Paves the way for concurrent multi-channel communications utilizing the same Rydberg states.
    • Highlights the potential of quantum-based antennas for next-generation communication systems.