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Area of Science:

  • Atomic physics
  • Quantum chemistry
  • Ultracold gases

Background:

  • Inelastic collisions between atoms and ions are crucial in ultracold chemistry and quantum simulations.
  • At low collision energies, spontaneous emission can suppress these inelastic collision pathways.
  • Understanding and controlling these suppressed pathways is key to advancing quantum technologies.

Purpose of the Study:

  • To investigate the suppression of inelastic atom-ion collisions at low energies.
  • To develop a novel technique for engineering and studying excited-state interactions in ultracold atom-ion systems.
  • To enable the study of excited-state collisions at ultracold temperatures.

Main Methods:

  • Utilized a precise collision energy control method for atom-ion (Ca+Yb+) collisions.
  • Investigated the role of spontaneous emission lifetime relative to collision complex lifetime.
  • Developed a laser-dressing technique using a catalyst laser to excite collision complexes.

Main Results:

  • Observed a dramatic suppression of inelastic collisions at low collision energies.
  • Demonstrated that this suppression is linked to spontaneous emission lifetimes.
  • Successfully engineered excited-state interactions by exciting collision complexes with a catalyst laser.

Conclusions:

  • The suppression of inelastic collisions is a universal phenomenon at low energies due to spontaneous emission.
  • Laser-dressing provides a general method to overcome this suppression and engineer ultracold excited-state interactions.
  • This technique opens new avenues for studying and controlling quantum phenomena in atom-ion systems.