Experts from the Fraunhofer Institute for Applied Optics and Precision Engineering IOF in Jena, developed a new satellite-based source for entangled photons. Twinned or »entangled« photons can be used for secure encryption. A quantum photon source may send a series of photons to one or two receivers through fibers or free space, and after some processing, the series may serve as a key for the encryption of the actual message. This is called quantum key distribution (QKD). QKD technology will be part of a new generation of space-based laser systems that will allow more secure communication among satellites and between satellites and ground stations.