Insider Brief:
Researchers at Quantum Source and the Weizmann Institute of Science trapped a single rubidium atom within 150–200 nanometers of a silicon-nitride photonic resonator, close enough for the atom to interact efficiently with light confined on a chip.
The experiment addresses a key challenge in combining neutral atoms with integrated photonics: holding an atom near a stable, planar chip-based resonator without losing it to the nearby surface.
The team used a “single-stroke loading” method that slows an approaching atom with an optical field and captures it after a single scattering event, reaching trapping probabilities of roughly 30 percent per loading pulse under optimal conditions.
The trapped atom emitted photons into the resonator and showed measurable atom–photon coupling, including single-emitter behavior and a cooperativity value above one, suggesting a possible building block for future chip-integrated quantum photonic systems.
