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Related Concept Videos

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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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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Spin–Spin Coupling: One-Bond Coupling01:17

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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The Pauli Exclusion Principle03:06

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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A dressed spin qubit in silicon.

Arne Laucht1, Rachpon Kalra1, Stephanie Simmons1

  • 1Centre for Quantum Computation and Communication Technology, School of Electrical Engineering and Telecommunications, UNSW Australia, Sydney, New South Wales 2052, Australia.

Nature Nanotechnology
|November 8, 2016
PubMed
Summary
This summary is machine-generated.

Coherent dressing of quantum systems in silicon enhances electron spin properties. This research demonstrates significantly longer coherence times, improving potential for scalable quantum computing architectures.

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Area of Science:

  • Quantum physics
  • Solid-state spin systems

Background:

  • Quantum two-level systems offer tunable properties and improved control.
  • Donor-bound electron spins in silicon are candidates for quantum bits.

Purpose of the Study:

  • Investigate properties of dressed donor-bound electron spins in silicon.
  • Assess potential as a quantum bit in scalable architectures.

Main Methods:

  • Coherent driving of dressed spin-polariton levels using oscillating magnetic/electric fields or detuning pulses.
  • Measurement of coherence times for dressed and undressed spins.

Main Results:

  • Achieved coherence times significantly longer (one order of magnitude) than undressed spins.
  • Demonstrated coherent coupling of dressed spins to electric fields and mechanical oscillations.

Conclusions:

  • Coherent dressing enhances electron spin properties for quantum applications.
  • Dressed states in silicon offer a promising route for scalable quantum computing.