Together with two French teams, the Australian researchers tested the system over a 265 m free-space in Toulouse.
They demonstrated coherent optical transmission through the atmosphere with residual frequency instabilities below state-of-the-art optical atomic clocks. The high-quality optical reference of the BASIK X15 module was vital for achieving ultra-stable coherent free-space transmission.
Get a summary of the experiment or read the whole thing in Nature Communications.