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Frequency tunable single photon diode based on giant atom coupling to a waveguide.

Guoqing Cai, Yunning Lu, Xiao-San Ma

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    |October 20, 2023
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    This summary is machine-generated.

    This study investigates single photon scattering in a waveguide coupled to a giant atom. Researchers found conditions to achieve perfect nonreciprocal scattering, enabling a tunable single photon diode.

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    Area of Science:

    • Quantum Optics
    • Atomic Physics
    • Photonics

    Background:

    • Investigating single photon scattering properties is crucial for developing quantum technologies.
    • Giant atoms interacting with waveguides offer unique platforms for controlling quantum states.
    • Nonreciprocal devices are essential components in photonic circuits for signal routing.

    Purpose of the Study:

    • To theoretically investigate single photon scattering properties in a waveguide coupled to a giant atom with a three-level system.
    • To determine the conditions for achieving perfect single photon nonreciprocal scattering in both Markovian and non-Markovian regimes.
    • To explore the realization of a frequency-tunable single photon diode.

    Main Methods:

    • Theoretical analysis of single photon scattering.
    • Derivation of analytical expressions for single photon scattering amplitudes.
    • Investigation of a giant atom with a three-level system coupled to a waveguide at two points and driven by a classical field.

    Main Results:

    • Identified parameters for perfect single photon nonreciprocal scattering in the Markovian regime, including external classical field, energy dissipation, coupling strength phase difference, and accumulated phase.
    • Demonstrated that perfect non-reciprocity is achievable in the non-Markovian regime despite increased complexity due to time delay.
    • Showcased the ability to switch nonreciprocity by controlling the classical field for resonant photons and achieve perfect non-reciprocal transmission for non-resonant photons by adjusting Rabi frequency.

    Conclusions:

    • The study provides a theoretical framework for realizing perfect single photon nonreciprocal scattering.
    • The proposed system offers a method for creating a frequency-tunable single photon diode.
    • This research contributes to the development of advanced quantum optical devices and components.