Since the 1850s, we've been laying cables across oceans to become better connected. Today, there are hundreds of thousands of miles of fiber optic cables constantly transmitting data between nations.

As Russian forces have intensified their advances in eastern Ukraine in recent weeks, they're being helped by a new tool on the battlefield: drones that fly with the use of fiber-optic cables.

Creating hybrid networks is challenging because quantum data is often transmitted through fiber-optic cables using entangled photons. Entanglement occurs when two qubits — the most basic units o ...