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Robust bilinear rotations.

Yannik T Woordes1, Tony Reinsperger2, Sebastian Ehni3

  • 1Institute of Organic Chemistry and Institute for Biological Interfaces 4 - Magnetic Resonance, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.

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|August 29, 2025
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Summary
This summary is machine-generated.

Researchers enhanced bilinear rotation elements in nuclear magnetic resonance (NMR) spectroscopy for robust spin manipulation. They developed compensated bilinear π-rotation (COB-BIRD) elements, improving performance in 2D NMR experiments.

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Area of Science:

  • Quantum technologies
  • Spectroscopy
  • Nuclear Magnetic Resonance (NMR)

Background:

  • Bilinear rotation elements enable interaction-dependent spin manipulation.
  • Robustness in spectroscopic filter elements is crucial for advanced applications.

Purpose of the Study:

  • To introduce and characterize robust bilinear rotation elements in NMR spectroscopy.
  • To develop fully compensated bilinear π-rotation elements for improved performance.

Main Methods:

  • Utilized adiabatic CHIRP-type and BUBI/BUBU pulses for enhanced robustness.
  • Optimized time-optimal coupling-compensated BIRD elements and pulse shapes.
  • Established and characterized coupling, offset, and B1-compensated bilinear π-rotation (COB-BIRD) elements.

Main Results:

  • Achieved improved robustness against offset/detuning and B1-field variations.
  • Demonstrated two performance levels: coupling-dependent inversion and full bilinear π-rotation.
  • Successfully implemented robust bilinear rotation capabilities in a 2D NMR experiment on a partially aligned sample.

Conclusions:

  • The developed COB-BIRD elements offer significant improvements in NMR spectroscopy.
  • Robust bilinear rotation capabilities are demonstrated for advanced spin manipulation techniques.
  • This work advances the application of bilinear rotations in quantum technologies and spectroscopy.