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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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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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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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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 de Broglie Wavelength02:32

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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Coherent Spin-Photon Interface with Waveguide Induced Cycling Transitions.

Martin Hayhurst Appel1, Alexey Tiranov1, Alisa Javadi2

  • 1Center for Hybrid Quantum Networks (Hy-Q), The Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark.

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Solid-state quantum dots enable efficient light-matter interfaces. Researchers achieved optical cyclicity up to 15 using photonic crystal waveguides, enabling spin control and photon manipulation for quantum applications.

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Optics and Photonics

Background:

  • Solid-state quantum dots are key for light-matter interfaces, linking spin and photon states.
  • Existing limitations include selection rules hindering efficient spin control and optical cyclicity.
  • Overcoming these barriers is crucial for advancing quantum technologies.

Purpose of the Study:

  • To experimentally demonstrate optical cyclicity in solid-state quantum dots.
  • To achieve high-fidelity spin initialization and coherent optical spin control.
  • To enable scalable multiphoton entanglement and on-chip spin-photon gates.

Main Methods:

  • Utilizing a photonic crystal waveguide for photonic state engineering.
  • Implementing high-fidelity spin initialization techniques.
  • Applying coherent optical methods for spin control.

Main Results:

  • Demonstrated optical cyclicity up to approximately 15.
  • Achieved high fidelity in spin initialization.
  • Showcased coherent optical spin control capabilities.

Conclusions:

  • Photonic crystal waveguides overcome limitations in quantum dot spin-photon interfaces.
  • The demonstrated capabilities are essential for scalable quantum entanglement and on-chip quantum gates.
  • This work paves the way for advanced solid-state quantum information processing.