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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Published on: August 5, 2013

Coupling a Single Trapped Atom to a Whispering-Gallery-Mode Microresonator.

Elisa Will¹, Luke Masters^1,2, Arno Rauschenbeutel^1,2

¹Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, 1020 Vienna, Austria.

Physical Review Letters

|June 25, 2021

Summary

We trapped a single Rubidium-85 atom near a microresonator, achieving strong coupling. This enables new quantum applications by controlling atom-light interactions.

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Area of Science:

Quantum optics
Atomic physics
Nanophotonics

Background:

Whispering-gallery-mode (WGM) microresonators offer strong light-matter interaction.
Controlling single atom-WGM coupling is crucial for quantum technologies.

Purpose of the Study:

To demonstrate stable trapping of a single atom near a WGM bottle microresonator.
To achieve strong coupling regime between the atom and the microresonator.
To enable quantum protocols utilizing chiral atom-light interactions.

Main Methods:

Trapping a single Rubidium-85 atom using a red-detuned focused laser beam retroreflected from the microresonator surface.
Counteracting light shift with a second laser beam to maintain atomic transition frequency.
Observing vacuum Rabi splitting in the excitation spectrum.

Main Results:

Stable trapping of a single ^{85}Rb atom at 200 nm from a bottle microresonator surface.
Observation of vacuum Rabi splitting, indicating strong coupling.
Demonstration of controlled single atom-WGM interaction.

Conclusions:

This work establishes controlled single atom-WGM interaction in the strong coupling regime.
It paves the way for quantum applications leveraging chiral atom-light coupling in microresonators.