Quantum Time Transfer (QTT)
Quantum laser links that sync clocks worldwide without GPS
Xairos
Colorado startup developing a timing service that uses quantum optical links to synchronize clocks to under a nanosecond across space and fiber networks, as a backup for systems that now depend on GPS. (1 product in the atlas)
Products, by altitude
High orbits · 2,000–35,786 km
In development
Government awards
| Date | Agency | Program | Amount |
|---|---|---|---|
| May 2026 | Innovate UK | TimeLink, Contracts for Innovation: Quantum Sensors and PNT Missions Primer (Phase 1) | GBP 1.4M1 |
| Oct 2025 | European Space Agency | NAVISP Element 2: Phase 2 of satellite Quantum Time Transfer, Xairos UK Ltd. as prime | Not disclosed2 |
| Feb 2025 | U.S. Space Force (SpaceWERX / AFRL) | SBIR Direct-to-Phase II: fusion PNT using quantum and optical synchronization of clock ensembles | $1.9M3 |
Milestones
- May 2026 Completed two-kilometer free-space tests of its Ares Quantum Optical Terminal, running quantum and optical links at the same time. Company statement4
Sources
Updated Oct 22, 2026 · How we source facts · Suggest a correction