Colloquium: Sergio Loarte Castro (Space Flight)

29 januari 2019 12:30 - Locatie: Lecture Room K, Faculty of Aerospace Engineering, Kluyverweg 1, Delft.

Towards a global space-based QKD network

Quantum Key Distribution (QKD) allows a symmetric key to be distributed to two parties in a secure manner. Several institutes are currently working on demonstrating QKD from space, needed to connect distant nodes due to high losses using optical fiber. In this thesis a further step into the future is taken, conceiving future trusted-node QKD satellite constellations.
A versatile model has been developed, able to simulate satellite-to-ground and inter-satellite QKD for any satellite constellation and ground station combination. Matlab scripts were integrated with the STK software package to compute free-space QKD links. To showcase the model capabilities, two scenarios are proposed, going over the design process of a trusted-node QKD constellation to distribute key to the ground nodes of each network. Different constellation types, key usage patterns and inter-satellite QKD are discussed, along with the detection and proposed solutions for the issues arising from the peculiarities of a QKD constellation.