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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Probing Dipolar Interactions between Rydberg Atoms and Ultracold Polar Molecules.

Lingbang Zhu1, Jeshurun Luke1, Roy Shaham1

  • 1Harvard-MIT Center for Ultracold Atoms, Harvard University, Harvard University, Department of Chemistry and Chemical Biology, Cambridge, Massachusetts 02138, USA, Department of Physics, Cambridge, Massachusetts 02138, USA, and , Cambridge, Massachusetts 02138, USA.

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Summary

We observed resonant energy transfer between ultracold potassium-rubidium molecules and Rydberg rubidium atoms. This demonstrates a key interaction for hybrid Rydberg-polar molecule systems.

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Area of Science:

  • Quantum physics
  • Ultracold atoms and molecules
  • Rydberg physics

Background:

  • Ultracold molecules and Rydberg atoms are promising for quantum technologies.
  • Controlling interactions between different quantum systems is crucial.
  • Hybrid systems combine advantages of different quantum species.

Purpose of the Study:

  • To investigate resonant dipolar interactions between ultracold KRb molecules and Rydberg Rb atoms.
  • To demonstrate and characterize energy transfer between these distinct quantum systems.
  • To explore the potential for hybrid Rydberg-polar molecule systems.

Main Methods:

  • Using an optically trapped ensemble of ultracold ^{40}K^{87}Rb molecules and Rydberg ^{87}Rb atoms.
  • Employing state-selective ionization detection for KRb molecules.
  • Applying a tunable external electric field to probe resonant interactions.
  • Utilizing Monte Carlo simulations based on a dipole-dipole interacting Hamiltonian.

Main Results:

  • Observed resonant energy transfer at 2.227 GHz from Rydberg atoms to molecules.
  • Measured a broadening of the Rb Rydberg excitation spectrum up to 3.5 MHz.
  • Experimental results matched predictions from Monte Carlo simulations.
  • Demonstrated interspecies dipolar interaction between Rydberg atoms and polar molecules.

Conclusions:

  • Resonant dipolar interactions can be effectively controlled and utilized.
  • This work establishes a foundation for hybrid Rydberg-polar molecule systems.
  • The demonstrated interaction is a critical component for leveraging combined quantum advantages.