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Related Concept Videos

Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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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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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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.
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Updated: Jun 8, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Dressed-State Hamiltonian Engineering in a Strongly Interacting Solid-State Spin Ensemble.

Haoyang Gao1, Nathaniel T Leitao1, Siddharth Dandavate1

  • 1Harvard University, Department of Physics, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|June 7, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to enhance spin interactions in quantum applications. This technique improves sensitivity in quantum sensing and magnetometry beyond current Floquet engineering limits.

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Area of Science:

  • Quantum science
  • Quantum metrology
  • Many-body physics

Background:

  • Dipolar interactions in spin ensembles are crucial for quantum applications.
  • Floquet engineering is a common technique but limits interaction strength and sensing sensitivity.

Purpose of the Study:

  • To develop an alternative method for tuning dipolar interactions in nitrogen-vacancy (NV) centers.
  • To overcome the limitations of Floquet engineering in enhancing metrological sensitivity.

Main Methods:

  • Utilized dressed-state qubit encoding under a bias magnetic field.
  • Applied the magnetic field perpendicular to the diamond crystal lattice orientation.
  • Directly tuned the native dipolar interaction in an ensemble of NV centers.

Main Results:

  • Achieved a 3.2x enhancement of the dimensionless coherence parameter (JT2) compared to Floquet engineering.
  • Demonstrated a 2.6x (8.3 dB) enhanced sensitivity in ac magnetometry.
  • Overcame limitations of reduced interaction strength and weakened coupling inherent to Floquet engineering.

Conclusions:

  • The developed method offers a powerful Hamiltonian engineering tool for NV ensembles.
  • This approach is applicable to other interacting higher-spin (S>1/2) systems.
  • Provides enhanced metrological sensitivity and coherence parameters for quantum applications.