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The de Broglie Wavelength02:32

The de Broglie Wavelength

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Related Experiment Video

Updated: Sep 13, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

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Frequency-controllable single-photon routing in a giant atom waveguide QED system.

Xuejian Sun

    Optics Express
    |July 30, 2025
    PubMed
    Summary

    We developed a controllable single-photon router using giant atom waveguide quantum electrodynamics (QED). This system achieves 100% routing efficiency when specific atomic states are tuned, offering enhanced control and robustness for quantum devices.

    Area of Science:

    • Quantum Information Science
    • Quantum Optics
    • Condensed Matter Physics

    Background:

    • Giant atom systems offer unique quantum electrodynamics (QED) interactions.
    • Waveguide QED is crucial for developing quantum communication and computation devices.
    • Controlling single-photon routing is essential for scalable quantum networks.

    Purpose of the Study:

    • To propose and analyze a frequency-controllable single-photon router.
    • To investigate the impact of giant atom configurations on photon routing.
    • To achieve deterministic and efficient single-photon routing in a waveguide QED system.

    Main Methods:

    • Utilized a real-space approach to derive analytical expressions for scattering amplitudes.
    • Analyzed three distinct giant atom topologies: separated, braided, and nested.

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    Related Experiment Videos

    Last Updated: Sep 13, 2025

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    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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  • Investigated the role of energy and decay rates of collective atomic states.

    • Main Results:

    • Derived exact analytical expressions for scattering amplitudes in all three topologies.
    • Identified conditions for 100% efficient, frequency-tunable single-photon routing: energy and decay rate degeneracy.
    • Demonstrated superior tunability and robustness compared to conventional atom waveguide QED systems.

    Conclusions:

    • A frequency-controllable single-photon router in a giant atom waveguide QED system is feasible.
    • Deterministic routing with 100% efficiency is achievable under specific atomic state conditions.
    • The proposed model offers enhanced performance for controllable single-photon router devices.