EU-funded scientists have demonstrated a scalable and on-demand way to harness photons that are connected to each other no matter how far away they are – a phenomenon known as quantum entanglement.
The use of the photons' quantum properties such as energy and spin to realise optical quantum networks is particularly appealing because photons are immune to disturbances from the surrounding environment. In addition, they are readily manipulated and also subject to high-efficiency detection.
Further details: Quantum entanglement increases information carried by photons