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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing...
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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.
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Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Coherent phonon source based on electron spin resonance in a quantum-dot qubit.

J Fransson1, J P Bird2

  • 1Department of Physics and Astronomy, Uppsala University, Box 516, 75120, Uppsala, Sweden. Jonas.Fransson@physics.uu.se.

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Summary
This summary is machine-generated.

Researchers developed a novel on-chip method to control phonon generation using electron-spin resonance in a quantum dot. This breakthrough enables tunable, single-phonon sourcing for quantum technologies.

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Area of Science:

  • Quantum phononics
  • Solid-state quantum systems
  • Quantum information science

Background:

  • Controlled phonon generation is crucial for quantum communication and state transduction.
  • Existing methods lack sufficient tunability and integration for advanced quantum applications.

Purpose of the Study:

  • To propose and describe a scheme for controlled phonon sourcing.
  • To enable the generation of single phonons at desired rates.
  • To facilitate the development of on-chip phononic circuits.

Main Methods:

  • Exploiting electron-spin resonance (ESR) between Zeeman-split levels.
  • Utilizing a gated quantum dot as the core component.
  • Implementing an on-chip electrical control mechanism.

Main Results:

  • Demonstrated a scheme for controlled phonon generation.
  • Achieved broad tunability of phonon energy.
  • Provided convenient electrical control over the sourcing process.

Conclusions:

  • The proposed scheme offers a compact and coherent source of phonons.
  • This method is well-suited for building extended phononic circuits.
  • Enables sourcing, transmission, and detection of phononic signals for quantum applications.