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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

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.
Interference and Superposition of Waves01:07

Interference and Superposition of Waves

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.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
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Phase-Contrast Microscopes
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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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Multimode quantum interference of photons in multiport integrated devices.

Alberto Peruzzo1, Anthony Laing, Alberto Politi

  • 1Centre for Quantum Photonics, H. H. Wills Physics Laboratory & Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, UK.

Nature Communications
|March 3, 2011
PubMed
Summary
This summary is machine-generated.

Researchers demonstrated quantum interference in multimode interference (MMI) devices, achieving high visibility. This shows MMI devices can simplify and enhance photonic quantum circuits for future quantum technologies.

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Area of Science:

  • Quantum optics
  • Integrated photonics
  • Silicon photonics

Background:

  • Photonics is crucial for quantum technologies.
  • Silicon chip-based optical waveguide circuits offer miniaturization and performance.
  • Multimode interference (MMI) devices enable compact, robust multiport circuits.

Purpose of the Study:

  • To demonstrate quantum interference in MMI devices.
  • To characterize the performance of 4x4 port MMI devices with photon pairs.
  • To develop a new characterization technique for multiport photonic devices.

Main Methods:

  • Fabrication and testing of 2x2 and 4x4 MMI couplers.
  • Quantum interference measurements with photon pairs.
  • Development of a phase-insensitive characterization method.

Main Results:

  • Achieved 95.6 ± 0.9% visibility in quantum interference for a 2x2 MMI coupler.
  • Demonstrated complex quantum interference in a 4x4 port MMI device.
  • Developed a novel multiport device characterization technique.

Conclusions:

  • MMI devices operate with high fidelity in the quantum regime.
  • MMI devices offer simplified and concatenated photonic quantum circuits.
  • The new characterization technique is broadly applicable to photonic devices.