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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Types Of Superconductors01:28

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...

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Related Experiment Video

Updated: May 28, 2026

Fabrication and Characterization of Superconducting Resonators
10:26

Fabrication and Characterization of Superconducting Resonators

Published on: May 21, 2016

Pound-locking for characterization of superconducting microresonators.

T Lindström1, J Burnett, M Oxborrow

  • 1National Physical Laboratory, Teddington TW11 0LW, United Kingdom.

The Review of Scientific Instruments
|November 4, 2011
PubMed
Summary

We developed a new Pound-locking technique to precisely measure superconducting microresonators. This method reveals noise characteristics and improves accuracy for advanced resonator property analysis.

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Fabrication and Characterization of Superconducting Resonators
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Area of Science:

  • Quantum Engineering
  • Materials Science
  • Metrology

Background:

  • Superconducting microresonators are crucial for quantum technologies.
  • Characterizing noise in these resonators is essential for performance.
  • Traditional methods have limitations in accessing certain resonator properties.

Purpose of the Study:

  • To introduce a novel application of the Pound-locking technique for superconducting microresonators.
  • To demonstrate its capability in characterizing resonator properties beyond traditional methods.
  • To analyze noise spectra and Allan deviation for insights into resonator noise.

Main Methods:

  • Implementation of the Pound-locking technique.
  • Comparison against stable frequency sources.
  • Analysis of noise spectra and Allan deviation.

Main Results:

  • The Pound-locking technique provides access to previously inaccessible resonator properties.
  • Valuable information about the nature of noise in superconducting planar resonators was obtained.
  • Significant improvements in read-out accuracy and measurement throughput were achieved.

Conclusions:

  • The Pound-locking technique offers a powerful new tool for superconducting microresonator characterization.
  • This method enhances understanding of noise mechanisms in these devices.
  • The technique improves measurement efficiency and precision for quantum applications.