Polarization-based Light-Atom Quantum Interface with an All-optical Trap

TL;DR

This paper demonstrates a polarization-based light-atom quantum interface using a large ensemble of cold rubidium atoms trapped in an all-optical dipole trap, enabling strong coupling and long storage times for quantum information applications.

Contribution

The study presents a novel all-optical trapping system with enhanced light-atom coupling and long coherence times for quantum information processing.

Findings

Achieved strong light-atom coupling in a cold atomic ensemble.

Performed thousands of measurements with minimal destruction.

Confirmed the potential for quantum information protocols.

Abstract

We describe the implementation of a system for studying light-matter interactions using an ensemble of $10^6$ cold rubidium 87 atoms, trapped in a single-beam optical dipole trap. In this configuration the elongated shape of the atomic cloud increases the strength of the collective light-atom coupling. Trapping all-optically allows for long storage times in a low decoherence environment. We are able to perform several thousands of measurements on one atomic ensemble with little destruction. We report results on paramagnetic Faraday rotations from a macroscopically polarized atomic ensemble. Our results confirm that strong light-atom coupling is achievable in this system which makes it attractive for single-pass quantum information protocols.