But the test is only the first step in a long road to solving technical difficulties.
Scientists from Russia and China have successfullydemonstratedquantum communication over satellite.
From a geopolitical perspective, it is further proof that Beijing and Moscow aredeepening high-tech cooperationfor military purposes.
This latest test is an advancement of the research the two countries are conducting in quantum communications.
There are practical limitations to such a feat though.
Scalability is still a problem as much of the advanced infrastructure needs to be built out.
Additionally, maintaining quantum signals over long distances remains problematic.
That is because quantum communications use particles of light to transmit data and are in a highly fragile state.
It was the longest stretch of fiber-optic cable ever used to enable quantum communications underwater.
