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Coherent spectroscopy with a single antiproton spin.

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Researchers achieved coherent quantum transition spectroscopy on a single antiproton spin, observing Rabi oscillations. This breakthrough advances precision measurements and tests of matter-antimatter symmetry.

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Area of Science:

  • Atomic, Molecular, and Optical (AMO) Physics
  • Quantum Metrology
  • Antimatter Physics

Background:

  • Coherent quantum transition spectroscopy is vital for metrology, quantum information, and precision physics.
  • Previous applications focused on macroscopic particle ensembles, not single nuclear spins.
  • Single free nuclear spin spectroscopy remained an experimental challenge.

Purpose of the Study:

  • To demonstrate coherent quantum transition spectroscopy on a single antiproton spin.
  • To advance precision measurements of fundamental particle properties.
  • To improve tests of matter-antimatter symmetry.

Main Methods:

  • Utilized a cryogenic Penning-trap system for single antiproton storage.
  • Employed a multi-trap technique with continuous Stern-Gerlach effect for spin detection.
  • Induced coherent dynamics and performed quantum-projection measurements in precision and analysis traps.

Main Results:

  • Observed Rabi oscillations of a single antiproton spin for the first time.
  • Achieved >80% spin-inversion probabilities with ~50s coherence times.
  • Demonstrated transition linewidths 16 times narrower than previous measurements.

Conclusions:

  • This work pioneers single antiproton spin spectroscopy.
  • The results represent a significant step towards enhanced matter-antimatter symmetry tests.
  • Future applications include tenfold improved magnetic moment comparisons.