Fiber ring resonator with a nanofiber section for chiral cavity quantum electrodynamics and multimode strong coupling

Area of Science:

• Quantum Optics
• Nanophotonics
• Fiber Optics

Background:

• Optical fiber ring resonators are crucial for quantum optics.
• Efficient interfacing with optical emitters requires strong light-matter interaction.
• Existing systems often face limitations in coupling efficiency and finesse.

Purpose of the Study:

• To experimentally realize a novel optical fiber ring resonator with enhanced evanescent field.
• To achieve strong coupling for quantum emitters.
• To explore applications in atom trapping and chiral quantum optics.

Main Methods:

• Fabrication of an optical fiber ring resonator with a subwavelength-diameter tapered waist.
• Utilizing a commercial tunable fiber beam splitter for robust coupling.
• Characterization of resonator parameters including finesse, free spectral range, and birefringence.

Main Results:

• Achieved an unloaded finesse of F=75±1, sufficient for strong coupling.
• Demonstrated significant evanescent field for efficient emitter interfacing.
• Identified suitability for trapping laser-cooled atoms and optical multimode strong coupling experiments.

Conclusions:

• The developed fiber ring resonator is a promising platform for strong light-matter interactions.
• It facilitates applications in quantum optics, including atom trapping and chiral quantum optics.
• The system's design offers tunable parameters and robust coupling for advanced quantum experiments.