Global Quantum Key Distribution using CubeSat-Based Photon Sources

The future of secure communication networks relies on the secure distribution of symmetric encryption keys. Current methods of distributing keys are either vulnerable (public key encryption has the capability of being cracked with quantum computers) or are expensive (couriers physically delivering keys to remote locations). The most secure method is to distribute keys from small satellites using Quantum Key Distribution (QKD). S15 Space Systems is a spin-off company that is developing space-based, quantum-safe communications built on research performed at the Centre for Quantum Technologies (CQT) at the National University of Singapore. The team is developing technologies such as QKD which harness unique properties of quantum physics to enable highly secured encryption services. QKD can generate encryption keys that are secure against computational hacks and that can be distributed to remote parties with solid guarantees that they have not been intercepted by man-in-the-middle eavesdroppers. Quantum light source hardware is being developed that fits on a 3U CubeSat, and a small constellation of these satellites can effectively service thousands of users