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Related Concept Videos

Interference and Diffraction02:18

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Two-photon quantum interference in integrated multi-mode interference devices.

Konstantinos Poulios, Daniel Fry, Alberto Politi

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    Silicon oxynitride multi-mode interference devices offer a compact platform for quantum interference. Researchers achieved high visibility (97.7%) in experiments, confirming their potential for multi-photon quantum applications.

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    Area of Science:

    • Quantum optics and photonics
    • Integrated photonics
    • Quantum information science

    Background:

    • Multi-mode interference (MMI) devices are compact photonic components.
    • MMI devices can introduce which-path information, potentially degrading quantum interference.
    • Silicon oxynitride (SiON) offers a suitable material platform for integrated photonics.

    Purpose of the Study:

    • To theoretically derive and experimentally validate the visibility of two-photon quantum interference in MMI devices.
    • To assess the performance of compact SiON MMI devices for multi-photon non-classical interference.
    • To investigate the impact of MMI geometry on quantum interference visibility.

    Main Methods:

    • Theoretical derivation of quantum interference visibility in MMI devices.
    • Fabrication of 2x2 MMI devices in silicon oxynitride (SiON) with a 2.4% refractive index contrast.
    • Experimental demonstration of two-photon interference visibility using fabricated SiON MMI devices.

    Main Results:

    • Theoretical prediction of near-unity visibility for compact SiON MMI devices.
    • Experimental demonstration of quantum interference visibilities up to 97.7% in 2x2 SiON MMI devices.
    • High visibility achieved without the need for narrow-band photons.

    Conclusions:

    • Compact SiON MMI devices provide a highly stable and effective platform for multi-photon non-classical interference.
    • The experimental results validate the theoretical predictions, confirming the potential of these devices for quantum applications.
    • MMI devices can maintain high quantum interference visibility, even with broadband photons.