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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 one, the...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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.
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Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

5.5K
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...
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

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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.
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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.6K
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...
3.6K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.7K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Quantum dot spin coherence governed by a strained nuclear environment.

R Stockill1, C Le Gall1, C Matthiesen1

  • 1Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, UK.

Nature Communications
|September 13, 2016
PubMed
Summary
This summary is machine-generated.

We uncovered how nuclear spin dynamics in quantum dots affect electron spin coherence. Applying large magnetic fields and reducing strain significantly enhances spin coherence times for quantum applications.

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Area of Science:

  • Quantum Information Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Confined electron-nucleus interactions in quantum dots are central to the quantum spin problem.
  • Quantum dots offer potential for quantum optical networks due to their spin coherence and spin-photon interfaces.
  • Understanding irreversible environmental dynamics is crucial for maximizing spin coherence.

Purpose of the Study:

  • To investigate the impact of nuclear spin bath dynamics on electron spin coherence in quantum dots.
  • To determine the intrinsic coherence time limited by nuclear spin interactions.
  • To identify strategies for improving electron spin coherence for quantum technologies.

Main Methods:

  • Utilized all-optical Hahn echo decoupling techniques.
  • Studied electron spin coherence dynamics under varying magnetic fields (2-3 Tesla).
  • Analyzed the influence of nuclear spin bath and strain inhomogeneity.

Main Results:

  • Recovered intrinsic electron spin coherence times, revealing microsecond-scale coherence.
  • Observed a dramatic increase in coherence times between 2 and 3 Tesla magnetic fields.
  • Demonstrated an exponential decay of coherence at higher magnetic fields.
  • Showcased the direct imprint of high-frequency nuclear dynamics on electron spin coherence.

Conclusions:

  • Electron spin coherence in quantum dots is significantly influenced by nuclear spin bath dynamics and strain.
  • Applying large magnetic fields and minimizing strain inhomogeneity are effective strategies to enhance spin coherence.
  • These findings pave the way for improved quantum optical networks and quantum information processing.