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NMR Spectroscopy: Spin–Spin Coupling01:08

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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...
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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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Spin–Spin Coupling Constant: Overview01:08

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

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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.
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...
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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.
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...
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Atomic Nuclei: Nuclear Spin01:08

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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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Spin-photon interface and spin-controlled photon switching in a nanobeam waveguide.

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Researchers developed an efficient spin-photon interface using electron spins in quantum dots. This breakthrough enables optical control of quantum information, paving the way for quantum networks.

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Area of Science:

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

Background:

  • Electron spin is a key candidate for quantum memory and quantum bits (qubits).
  • Establishing quantum networks requires connecting spatially separated spin states.
  • An integrated spin-photon interface is crucial for merging spin memory with photonic information transfer.

Purpose of the Study:

  • To demonstrate an efficient and optically programmable interface between electron spins in quantum dots and photons.
  • To leverage this interface for controlling quantum information transfer.

Main Methods:

  • Utilized a quantum dot system to host electron spins.
  • Developed a nanophotonic waveguide for photon interaction.
  • Implemented optical control for spin preparation and manipulation.
  • Achieved deterministic spin preparation with up to 96% fidelity.

Main Results:

  • Demonstrated an efficient spin-photon interface integrated within a nanophotonic waveguide.
  • Successfully implemented a single-spin photonic switch, where the electron spin state controls photon flow.
  • Achieved high fidelity (up to 96%) in deterministic spin state preparation.

Conclusions:

  • The developed spin-photon interface efficiently links electron spin quantum memory with photonic information carriers.
  • This technology is a significant step towards building quantum nodes and networks.
  • Potential applications include on-chip photon-photon gates, single-photon transistors, and photonic cluster state generation.