Record-setting quantum entanglement connects two atoms across 20 miles

 https://newatlas.com/telecommunications/quantum-entanglement-atoms-distance-record/

"entangled two rubidium atoms kept in optical traps in two different buildings... separated by 700 m (2,297 ft) of fiber optics... extended 33 km with extra spools of cable. Each atom excited with laser pulse, causes to emit photon quantum entangled with atom... photons sent down fiber optic cables meet receiving station... photons undergo a joint measurement, which entangles them – and because they’re each already entangled with their own atom, the two atoms become entangled with each other as well"

Related: Researchers entangle ions across a 230-meter quantum network
https://phys.org/news/2023-02-entangle-ions-meter-quantum-network.html