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Related Concept Videos

Gyroscope: Precession01:24

Gyroscope: Precession

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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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Gyroscope01:02

Gyroscope

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A gyroscope is defined as a spinning disk in which the axis of rotation is free to assume any orientation. When spinning, the orientation of the spin axis is unaffected by the orientation of the body that encloses it. The body or vehicle enclosing the gyroscope can be moved from place to place, while the orientation of the spin axis remains the same. This makes gyroscopes very useful in navigation, especially where magnetic compasses cannot be used, such as in crewed and crewless spacecraft,...
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Galvanometer01:24

Galvanometer

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Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing...
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Physical Pendulum01:06

Physical Pendulum

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When a rigid body is hanging freely from a fixed pivot point and is displaced, it oscillates similar to a simple pendulum and is known as a physical pendulum. The period and angular frequency of a physical pendulum are obtained by using the small-angle approximation and drawing parallels with a spring-mass system. The small-angle approximation (sinθ=θ) is valid up to about 14°.
When dealing with complicated systems, the mass moment of inertia is an important parameter, as it...
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Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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Related Experiment Video

Updated: May 5, 2026

Implementation of a Reference Interferometer for Nanodetection
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Quantum gyroscope based on the cavity-magnon system.

Zhe-Qi Yang, Lei Chen, Yu-Rong Lin

    Optics Express
    |May 4, 2026
    PubMed
    Summary

    This study introduces a quantum gyroscope using cavity-magnon systems for enhanced rotation sensing. It achieves high precision beyond the shot-noise limit and offers miniaturization potential for inertial navigation.

    Area of Science:

    • Quantum optics
    • Condensed matter physics
    • Quantum sensing

    Background:

    • Quantum gyroscopes are crucial for high-precision rotation sensing.
    • Current designs face limitations in size and sensitivity, especially in noisy environments.
    • Cavity-magnon systems offer a promising platform for quantum metrology.

    Purpose of the Study:

    • To propose a novel quantum gyroscope scheme utilizing cavity-magnon interactions.
    • To enhance rotation angular velocity sensing precision beyond the standard quantum limit.
    • To explore the feasibility of miniaturized quantum gyroscopes with improved robustness.

    Main Methods:

    • Utilizing a cavity-magnon system coupled via hybrid light-magnon interactions.
    • Employing a two-mode squeezed coherent state as the quantum metrological probe.

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  • Investigating performance in both Markovian and non-Markovian (dissipative) environments.

    • Main Results:

    • The proposed scheme significantly enhances quantum gyroscope sensitivity, surpassing the shot-noise limit.
    • Performance in a dissipative environment remains stable under specific spectral density conditions.
    • The design overcomes size constraints of existing quantum gyroscope technologies.

    Conclusions:

    • The cavity-magnon quantum gyroscope offers a pathway to sub-microradian precision sensing.
    • This technology addresses key challenges in miniaturization and operation under ambient noise.
    • Findings are critical for advancing inertial navigation systems.