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Related Concept Videos

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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,...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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

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.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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 have a...
Valence Bond Theory02:42

Valence Bond Theory

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...
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:

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Related Experiment Video

Updated: Jun 12, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Solid-state spin-photon quantum interface without spin-orbit coupling.

Martin Claassen1, Hakan E Türeci, Atac Imamoğlu

  • 1Institute for Quantum Electronics, ETH-Zürich, CH-8093 Zürich, Switzerland.

Physical Review Letters
|May 21, 2010
PubMed
Summary
This summary is machine-generated.

Coherent optical control of single confined spins is demonstrated without spin-orbit coupling. Reservoir-assisted spin dynamics enable precise optical spin rotations, crucial for quantum information processing.

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Related Experiment Videos

Last Updated: Jun 12, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
12:19

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Area of Science:

  • Quantum physics
  • Spintronics
  • Optics

Background:

  • Spin-orbit coupling is typically required for coherent spin manipulation.
  • Understanding spin dynamics in quantum systems is essential for quantum technologies.

Purpose of the Study:

  • To demonstrate coherent optical manipulation of a single confined spin without spin-orbit coupling.
  • To investigate the role of reservoir-induced coherence in spin dynamics.

Main Methods:

  • Modeling non-Markovian dynamics of a single valence orbital hole spin.
  • Simulating optically induced spin-exchange coupling with a polarized electron gas.
  • Analyzing the competition between coherent and dissipative spin dynamics.

Main Results:

  • Coherent optical spin manipulation is achieved without spin-orbit coupling.
  • Fermionic nature of the electron gas reservoir induces coherence without entanglement.
  • Distinct behaviors of coherent and dissipative components at different timescales were identified.

Conclusions:

  • Coherent optical control of spins is feasible even without spin-orbit coupling.
  • Reservoir engineering offers a novel pathway for coherent spin manipulation.
  • High fidelity optical spin rotations can be achieved, advancing quantum control.