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Energy Stored In A Coaxial Cable01:31

Energy Stored In A Coaxial Cable

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A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic field...
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Related Experiment Video

Updated: May 2, 2026

Fabrication and Characterization of Superconducting Resonators
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Note: cryogenic coaxial microwave filters.

G Tancredi1, S Schmidlin1, P J Meeson1

  • 1Department of Physics, Royal Holloway, University of London, Egham TW20 0EX, United Kingdom.

The Review of Scientific Instruments
|March 6, 2014
PubMed
Summary
This summary is machine-generated.

We designed and tested a coaxial filter to control electromagnetic radiation for quantum experiments. The filter performs as predicted and works effectively at millikelvin temperatures.

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Area of Science:

  • Quantum Information Science
  • Metrology
  • Electromagnetics

Background:

  • Precise control of the electromagnetic environment is crucial for quantum information processing and metrology.
  • Experiments at millikelvin temperatures require effective filtering of microwave radiation.

Purpose of the Study:

  • To design and fabricate a coaxial filter assembly for controlling microwave electromagnetic radiation.
  • To validate the filter's performance against theoretical models.
  • To test the filter's functionality in a quantum experiment at 15 mK.

Main Methods:

  • Design and fabrication of a coaxial filter assembly.
  • Theoretical modeling of filter performance.
  • Current-voltage measurements of Josephson junctions at 15 mK.

Main Results:

  • The fabricated coaxial filter assembly's performance matched theoretical predictions.
  • The filters demonstrated effective operation in a low-temperature quantum environment.
  • Indicative tests confirmed the filters' suitability for quantum experiments.

Conclusions:

  • The developed coaxial filter assembly is a reliable component for managing electromagnetic radiation in sensitive quantum experiments.
  • The filter design and performance validation pave the way for improved quantum information processing and metrology at millikelvin temperatures.