➀ Researchers at Sandia National Laboratories have utilized silicon photonics for atom interferometry, a quantum sensing technique that measures acceleration with high precision, potentially enabling a quantum compass for navigation without GPS. ➁ The team has made significant strides in miniaturizing the atom interferometer, reducing its size, weight, and power requirements, and improving the performance of the modulators used in the laser system. ➂ The advancements in silicon photonics could lead to cost-effective mass production of quantum inertial measurement units, opening up new applications in navigation, underground resource detection, and other fields.