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Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers

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Quantifying Light-Assisted Collisions in Optical Tweezers across the Hyperfine Spectrum.

Steven K Pampel¹, Matteo Marinelli¹, Mark O Brown¹

¹University of Colorado, JILA, National Institute of Standards and Technology and University of Colorado, and Department of Physics, Boulder, Colorado 80309, USA.

Physical Review Letters

|February 6, 2025

Summary

This summary is machine-generated.

We explored how atomic hyperfine structure influences light-assisted collisions in optical tweezers. This research reveals methods to control cold atoms and molecules for quantum applications.

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Area of Science:

Atomic, Molecular, and Optical (AMO) Physics
Quantum Science and Technology
Cold Atom Physics

Background:

Resonant-dipole interactions are crucial for controlling cold atoms.
Hyperfine structure plays a significant role in atom-atom interactions.
Light-assisted collisions (LACs) are a key phenomenon in cold atom experiments.

Purpose of the Study:

To investigate the impact of hyperfine structure on resonant-dipole interactions between two cotrapped atoms.
To measure two-body loss rates from LACs across the Rubidium-87 hyperfine spectrum.
To connect experimental loss rates to molecular photoassociation potentials using a semiclassical model.

Main Methods:

Measured two-body loss rates from light-assisted collisions (LACs) in an optical tweezer.
Utilized a novel imaging technique leveraging repulsive LACs for two-atom detection.
Employed a semiclassical model to link collision data to molecular photoassociation potentials.

Main Results:

Quantified two-body loss rates across the Rubidium-87 hyperfine spectrum.
Established a connection between LACs and molecular photoassociation potentials.
Demonstrated a new imaging method overcoming parity constraints in optical tweezers.

Conclusions:

Hyperfine structure significantly influences resonant-dipole interactions and LACs.
The developed imaging technique enables precise detection of two atoms in a trap.
Findings provide insights for controlling cold atoms and molecules in quantum applications.