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Quantum-limited directional amplifier based on a triple-cavity optomechanical system.

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    We propose a quantum-limited directional amplifier using a triple-cavity optomechanical system. This system enables directional amplification between microwave and optical photons, approaching the standard quantum limit.

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    Area of Science:

    • Quantum Optics
    • Optomechanics
    • Cavity Quantum Electrodynamics

    Background:

    • Optomechanical systems couple mechanical motion to light.
    • Directional amplifiers are crucial for quantum information processing.
    • Achieving quantum-limited amplification with low noise is a key challenge.

    Purpose of the Study:

    • To theoretically propose a scheme for a quantum-limited directional amplifier.
    • To investigate directional amplification in a triple-cavity optomechanical system.
    • To explore methods for enhancing gain, bandwidth, and noise suppression.

    Main Methods:

    • Theoretical modeling of a triple-cavity optomechanical system.
    • Analysis of coupled cavity modes involving microwave and optical photons.
    • Investigation of gain and conversion processes.
    • Modulation of amplification direction via phase control.

    Main Results:

    • Demonstrated directional amplification between microwave and optical photons.
    • Identified two gain and one conversion process for directional amplification.
    • Showed that amplification direction is controllable by phase differences.
    • Found that increasing optomechanical cooperativity enhances gain and bandwidth while suppressing noise.

    Conclusions:

    • The proposed scheme offers a pathway to quantum-limited directional amplification.
    • The system's performance, including gain and noise, can be optimized.
    • This work has implications for quantum technologies requiring sensitive signal amplification.