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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:
Linear Approximation in Frequency Domain01:26

Linear Approximation in Frequency Domain

Linear systems are characterized by two main properties: superposition and homogeneity. Superposition allows the response to multiple inputs to be the sum of the responses to each individual input. Homogeneity ensures that scaling an input by a scalar results in the response being scaled by the same scalar.
In contrast, nonlinear systems do not inherently possess these properties. However, for small deviations around an operating point, a nonlinear system can often be approximated as linear.

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Related Experiment Video

Updated: Jun 23, 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

Direct characterization of a nonlinear photonic circuit's wave function with laser light.

Francesco Lenzini1, Alexander N Poddubny2,3,4, James Titchener2

  • 1Centre for Quantum Dynamics, Griffith University, Brisbane, QLD 4111, Australia.

Light, Science & Applications
|March 7, 2019
PubMed
Summary

Researchers developed a fast method to characterize quantum states from integrated photonic circuits. This technique uses classical measurements to precisely evaluate complex nonlinear quantum photonic networks.

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Last Updated: Jun 23, 2026

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Area of Science:

  • Quantum optics and integrated photonics
  • Development of quantum technologies

Background:

  • Integrated photonics is crucial for quantum technologies like state generation, computation, and communication.
  • Characterizing complex photonic circuits is challenging due to the impracticality of full quantum tomography.

Purpose of the Study:

  • To propose and demonstrate an efficient method for characterizing two-photon states from nonlinear optical circuits.
  • To overcome limitations of previous characterization methods for lossy, multi-mode devices.

Main Methods:

  • Established a correspondence between quantum states and classical sum-frequency generation measurements.
  • Applied the protocol to a multi-channel nonlinear waveguide network.

Main Results:

  • Demonstrated a fast and reliable method for reconstructing two-photon states.
  • Achieved a high fidelity of 99.28±0.31% between classical and quantum characterization.
  • Successfully evaluated a multi-channel nonlinear waveguide network.

Conclusions:

  • The developed technique enables fast and precise evaluation of nonlinear quantum photonic networks.
  • This is a crucial advancement for the production of complex, large-scale quantum devices.