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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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:
Carrier Generation and Recombination01:22

Carrier Generation and Recombination

Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...

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Related Experiment Video

Updated: Jun 12, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

Published on: November 30, 2012

Pure narrowband photon-pair generation in a monolithic cavity.

Xavier Barcons Planas, Helen M Chrzanowski, Janik Wolters

    Optics Express
    |June 11, 2026
    PubMed
    Summary

    Researchers developed a new heralded single-photon source for quantum technologies. This source achieves high spectral purity (96.2%) and efficiency, crucial for advancing photonic quantum applications.

    Area of Science:

    • Quantum optics and photonics
    • Single-photon sources
    • Quantum information science

    Background:

    • Photonic quantum technologies rely on efficient sources of pure single photons.
    • Existing sources often face limitations in spectral purity and multi-photon contamination.

    Purpose of the Study:

    • To present a novel heralded single-photon source utilizing spontaneous parametric down-conversion (SPDC).
    • To optimize the source for high spectral and spatial purity for quantum applications.
    • To achieve high heralding efficiency and low multi-photon contamination.

    Main Methods:

    • Employed a monolithic cavity optimized for SPDC.
    • Utilized cavity enhancement to generate photons into a central mode.
    • Implemented spectral isolation using an etalon to enhance spectral purity.

    More Related Videos

    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
    07:56

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

    Published on: September 5, 2019

    Related Experiment Videos

    Last Updated: Jun 12, 2026

    Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
    11:08

    Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

    Published on: November 30, 2012

    Generation and Coherent Control of Pulsed Quantum Frequency Combs
    06:42

    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
    07:56

    A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

    Published on: September 5, 2019

    Main Results:

    • Achieved a maximum heralding efficiency of 70% at 1540 nm.
    • Maintained multi-photon contamination below 3%.
    • Demonstrated a measured spectral purity of (96.2±2.7)% after spectral isolation.

    Conclusions:

    • The developed heralded single-photon source meets critical requirements for photonic quantum technologies.
    • High spectral purity and efficiency pave the way for improved quantum communication and computation.
    • Cavity enhancement combined with spectral filtering is effective for generating high-quality single photons.