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Standing Waves in a Cavity01:28

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Mechanical systems are analogous to to electrical networks where springs and masses play similar roles to inductors and capacitors, respectively. A viscous damper in mechanical systems functions similarly to a resistor in electrical networks, dissipating energy. The forces acting on a mass in such systems include an applied force in the direction of motion, counteracted by forces from the spring, a viscous damper, and the mass's acceleration. This interplay of forces is mathematically...
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Related Experiment Video

Updated: Feb 25, 2026

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Entanglement dynamics in double-cavity optomechanical systems.

Zhi Xin Chen, Qing Lin, Bing He

    Optics Express
    |August 10, 2017
    PubMed
    Summary

    This study explores entanglement dynamics in a double-cavity optomechanical system using a full quantum approach. It reveals how different driving conditions affect entanglement between optical and mechanical elements.

    Area of Science:

    • Quantum mechanics
    • Optomechanics
    • Cavity optomechanics

    Background:

    • Optomechanical systems couple optical fields to mechanical resonators.
    • Entanglement is a key quantum resource with applications in computing and sensing.
    • Double-cavity systems offer enhanced control over quantum states.

    Purpose of the Study:

    • To investigate entanglement dynamics in a double-cavity optomechanical system.
    • To analyze entanglement between cavity and mechanical modes.
    • To explore entanglement between two cavity modes under various driving conditions.

    Main Methods:

    • A complete quantum approach was employed, avoiding fluctuation expansion.
    • Entanglement evolution was studied for different drive detunings (same blue, same red, mixed red-blue).

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  • The relationship between entanglement and photon hopping rate was examined.

    • Main Results:

    • The study details entanglement dynamics under various driving schemes.
    • It quantifies entanglement between optical and mechanical modes.
    • The influence of photon hopping on entanglement is elucidated.

    Conclusions:

    • The research provides a comprehensive quantum analysis of entanglement in double-cavity optomechanics.
    • Findings highlight the tunability of entanglement through drive parameters.
    • The work contributes to understanding quantum correlations in complex optomechanical setups.