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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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 one, the...
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

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.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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 in...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...

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Related Experiment Video

Updated: May 11, 2026

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

Nuclear spin effects in semiconductor quantum dots.

E A Chekhovich1, M N Makhonin, A I Tartakovskii

  • 1Department of Physics and Astronomy, University of Sheffield, Sheffield, UK.

Nature Materials
|May 23, 2013
PubMed
Summary
This summary is machine-generated.

Researchers explored the central spin problem in semiconductor quantum dots, focusing on controlling nuclear spins to improve quantum computation. Experiments show manipulation of nuclear spins significantly impacts electron spin coherence.

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Last Updated: May 11, 2026

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Area of Science:

  • Quantum Information Science
  • Condensed Matter Physics
  • Semiconductor Spintronics

Background:

  • The central spin problem describes the interaction between an electronic spin and its surrounding nuclear spins.
  • This interaction is crucial for spin-based quantum computation in semiconductor quantum dots.
  • Controlling the nuclear spin environment is key to enhancing quantum information processing.

Purpose of the Study:

  • To review recent experimental and theoretical advancements in understanding the central spin problem.
  • To highlight the role of nuclear spin manipulation in semiconductor quantum dots.
  • To discuss implications for quantum information science.

Main Methods:

  • Review of optical and transport experiments on semiconductor quantum dots.
  • Focus on the interaction between a single electron/hole spin and 10^4-10^6 nuclear spins.
  • Examination of nuclear magnetic resonance and dynamic nuclear polarization techniques.

Main Results:

  • Demonstration of independent control over nuclear spin baths.
  • Observation of significant consequences of nuclear spin manipulation on central spin coherence.
  • Exploration of techniques to control and utilize the nuclear spin environment.

Conclusions:

  • The central spin problem in quantum dots presents both challenges and opportunities for quantum computation.
  • Effective manipulation of nuclear spins is vital for advancing quantum information science.
  • Continued research in this area promises breakthroughs in scalable quantum technologies.