An experimental and theoretical study has revealed that laser phase noise can be the dominant source of heating in optical lattices, surpassing intensity noise. This finding is particularly relevant for light atoms and deep optical lattices, where precise temperature control is crucial for applications such as quantum computing or material simulation. Traditionally, attention has focused on intensity noise as a limiting factor, but this research underscores the importance of considering phase noise to improve the stability of these systems.

The researchers developed a simple theoretical framework that allows predicting phase-noise-induced heating from the power spectral density of the laser phase noise, a quantity that can be measured experimentally. This model was successfully validated through experiments conducted with lithium-6 (⁶Li) atoms confined in a triangular optical lattice. The experimental results of the measured heating rates matched the theoretical predictions, confirming the validity of the approach.

This advance is significant because it provides a tool to understand and mitigate heating in optical lattices, a fundamental challenge for the development of quantum technologies. The ability to predict and control phase-noise-induced heating will enable the design of more robust and efficient systems. The proposed method is generalizable to other lattice geometries and different atomic species, extending its applicability to a wide range of experiments with cold atoms and optical lattices.