研究目的
To demonstrate the coupling of thermal rubidium atoms to a nanophotonic ring resonator integrated into a vapor cell, as a step towards miniaturization and scalability of atom–cavity systems for quantum networks.
研究成果
The study demonstrates the coupling of thermal rubidium atoms to a nanophotonic ring resonator integrated into a vapor cell, providing a key step towards miniaturization and scalability of atom–cavity systems. Despite the limitations, the approach promises a scalable and integrable platform for nonlinear optics on the single photon level and quantum networks.
研究不足
The coupling between atoms and the cavity mode is much lower compared to cavity QED experiments, and the system is affected by Doppler and transit time broadening. Strong coupling is not yet achieved.
1：Experimental Design and Method Selection:
The study involves integrating arrays of ring resonators into a vapor cell to couple thermal rubidium atoms to photonic cavities. The interaction is probed via a bus waveguide terminated with grating couplers for in- and out-coupling of light.
2：Sample Selection and Data Sources:
Thermal rubidium atoms above room temperature are used, with the atom density controlled by heating a rubidium reservoir attached to the cell.
3：List of Experimental Equipment and Materials:
A Si3N4 ring resonator with a radius of 80 μm on a borosilicate substrate, covered with a 600 nm thick layer of silicon dioxide (SiO2) and a 9 nm thick sapphire (Al2O3) coating for protection against rubidium atoms.
4：Experimental Procedures and Operational Workflow:
The ring resonance frequency is tuned with respect to the atomic resonance by varying the temperature of the chip. Transmission spectra are recorded for various positions within the ring resonance and for different input powers to study the saturation behavior.
5：Data Analysis Methods:
The transmission spectra are fitted with a theoretical model to extract parameters such as the round trip transmission factor, the straight-through coefficient, the Lorentz width of the atoms, and the atom-resonator detuning.
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