Xairos UK Ltd has launched Phase 2 of its quantum time transfer project supported by the European Space Agency's Navigation Innovation and Support Programme (NAVISP). Acting as prime contractor, Xairos leads a consortium with ViaSat and Heriot-Watt University to improve the precision and security of timing synchronization between terrestrial and satellite clocks using quantum technology.
T by Sophie Jenkins
London, UK (SPX) Oct 31, 2025
Xairos UK Ltd has launched Phase 2 of its quantum time transfer project supported by the European Space Agency's Navigation Innovation and Support Programme (NAVISP). Acting as prime contractor, Xairos leads a consortium with ViaSat and Heriot-Watt University to improve the precision and security of timing synchronization between terrestrial and satellite clocks using quantum technology.
The team is advancing satellite-based Quantum Time Transfer (QTT), a system capable of high-security, picosecond-level time exchange. QTT employs pairs of photons that are entangled in time, frequency, and polarisation to securely transmit time and frequency information.
This phase involves three main objectives. The first is to refine the High-Fidelity QTT Simulation Model, adding detail to system-level baselines set in Phase 1. The second objective is testing and developing a space-qualified QTT entangled photon source, building on earlier design work. Finally, the consortium will elaborate an implementation roadmap, expanding on initial commercialisation studies to draft a full deployment strategy.
This work falls under the European Space Agency's NAVISP Element 2 program, dedicated to advancing new positioning, navigation, and timing technologies beyond conventional satellite navigation. NAVISP supports commercial innovation and risk reduction, enabling new products and increasing market potential for European industry.
"The continued support of this activity of Xairos underscores the importance of quantum technology for more accurate and resilient timing synchronization in the UK. Xairos is leading the development of satellite-based Quantum Time Transfer."
Related Links
Xairos UK Ltd
Understanding Time and Space