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Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

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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

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

1.4K
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...
1.4K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.3K
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

Spin–Spin Coupling Constant: Overview

1.4K
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...
1.4K
Van der Waals Interactions01:24

Van der Waals Interactions

69.7K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Rydberg Atom Entanglements in the Weak Coupling Regime.

Hanlae Jo1, Yunheung Song1, Minhyuk Kim1

  • 1Department of Physics, KAIST, Daejeon 305-701, Korea.

Physical Review Letters
|February 8, 2020
PubMed
Summary
This summary is machine-generated.

We developed a new Rydberg atom entanglement method using van der Waals interactions. This technique enables controlled phase operations and complex entanglement, demonstrated with rubidium atoms achieving 0.59 fidelity.

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Area of Science:

  • Quantum physics
  • Atomic physics
  • Quantum information science

Background:

  • Rydberg atoms are highly sensitive to external fields, making them promising for quantum applications.
  • Controlled entanglement of multiple atoms is crucial for advancing quantum computing and simulation.
  • Existing entanglement schemes face limitations in scalability and control over inter-atomic distances.

Purpose of the Study:

  • To propose and experimentally demonstrate a novel entanglement scheme for Rydberg atoms.
  • To achieve controlled phase operations between atoms beyond the standard Rydberg blockade distance.
  • To explore complex entanglement structures, including multi-atom states and counterintuitive scenarios.

Main Methods:

  • Utilizing the van der Waals interaction phase induced by Ramsey-type pulsed interactions.
  • Employing single rubidium atoms confined in optical tweezer dipole traps for experimental control.
  • Implementing a scheme that allows entanglement generation even with partially blockaded atoms.

Main Results:

  • Demonstrated controlled phase operations between Rydberg atoms separated by distances exceeding the blockade radius.
  • Generated various entanglement states, including two-atom entanglement with a nearby third atom.
  • Successfully produced W-states for three partially blockaded atoms.
  • Achieved an experimental entanglement fidelity of F=0.59±0.11 for the proposed scheme.

Conclusions:

  • The proposed entanglement scheme offers a versatile and robust method for generating complex quantum states with Rydberg atoms.
  • The technique overcomes limitations of traditional Rydberg blockade, enabling entanglement over larger distances and in challenging multi-atom configurations.
  • Experimental validation with rubidium atoms confirms the feasibility and effectiveness of the entanglement strategy, paving the way for advanced quantum technologies.