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Formation of Ultracold Molecules by Merging Optical Tweezers.

Daniel K Ruttley1, Alexander Guttridge1, Stefan Spence1

  • 1Department of Physics and Joint Quantum Centre (JQC) Durham-Newcastle, Durham University, South Road, Durham, DH1 3LE, United Kingdom.

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|June 16, 2023
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Researchers created a single rubidium-cesium (RbCs) molecule by merging atoms in optical tweezers. Molecule formation probability is controllable by adjusting trap confinement, achieving efficiencies comparable to magnetoassociation.

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Area of Science:

  • Quantum physics
  • Atomic physics
  • Molecular physics

Background:

  • Ultracold atoms are crucial for quantum simulations and precision measurements.
  • Creating molecules from individual atoms is a key challenge in atomic physics.
  • Optical tweezers provide precise control over individual atoms.

Purpose of the Study:

  • To demonstrate the formation of a single RbCs molecule using merging optical tweezers.
  • To investigate the control over molecule formation probability.
  • To compare the efficiency of this method with existing techniques like magnetoassociation.

Main Methods:

  • Loading individual rubidium (Rb) and cesium (Cs) atoms into separate optical tweezers.
  • Ensuring atoms are in their motional ground states.
  • Merging the optical tweezers to facilitate atom collision and molecule formation.
  • Measuring the binding energy to confirm molecule formation and determine its state.
  • Tuning trap confinement during merging to study its effect on formation probability.

Main Results:

  • Successfully demonstrated the formation of a single RbCs molecule.
  • Confirmed molecule formation by measuring its binding energy.
  • Showed that molecule formation probability can be controlled by adjusting trap confinement.
  • Achieved conversion efficiencies comparable to magnetoassociation.

Conclusions:

  • Merging atoms in optical tweezers is an effective method for creating ultracold molecules.
  • Trap confinement is a key parameter for controlling the efficiency of molecule formation.
  • This technique offers a viable alternative to magnetoassociation for producing ultracold molecules.