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Next steps in Quantum Key Distribution

Demcon Focal contributes to the realization of a space-based Entangled Photon Source

Secure communication and data protection are essential for digital security and industrial competitiveness in today’s information-technology based world. Quantum-key distribution (QKD) is cryptographic method that provides security by providing a encryption key only known to shared parties. This is possible through the concept of ‘entanglement’: a pair of entangled photons are generated by a device and sent to the encryption partners. If an eavesdropper intercepts the entangled photons intended for one party, this is detectable by the other party.

Demcon Focal is working within a European consortium on a so-called Entangled Photon Source (EPS). This EPS will generate and distribute the encryption keys that allows parties to communicate securely. The EPS is a quantum-optics device that is intended to be placed on a satellite to be able to provide secure communication over large distances. Demcon Focal is responsible for the opto-mechanical design and assembly of the EPS within the consortium. The challenges in the project are the relatively short time-span during which the EPS design needs to be taken from TRL-3 to TRL-6, the challenging requirements relating to the harsh temperature conditions in space and mechanical vibrations during launch. And in addition, the quality and quantity of the EPS signal that are heavily dependent on the coupling efficiencies of the optical channels within the device.

The project is running for a duration of approximately 3 years and will result in a tested EPS in representative environment (Technology level TRL-6). Demcon Focal will closely work together with the companies QuTechSpace, OHB, and Alter within this project.