CSIRO Builds Quantum Light Sources to Beat GPS Jamming and Spoofing
GPS signals arrive at Earth so faint that a modest transmitter can drown them out or replace them with a convincing fake. Australia’s national science agency has built two portable devices meant to give operators a timing signal an attacker can’t copy. The technology runs on pairs of entangled photons, and the physics that makes it useful is the same that makes it hard to tamper with.
How the Quantum Light Source Works
Per a July 7 report, CSIRO developed the devices as part of a project led by Australia’s Defence Science and Technology Group. Each unit, which the agency calls the Quantum Light Source, produces pairs of light particles linked through quantum entanglement. One photon stays on the ground at an optical ground station as its partner travels to a satellite hundreds of kilometers overhead.
That link carries a secure timing reference. Any attempt to intercept or alter the signal changes the quantum state of the photons, and that change shows up instantly, so users can drop the compromised channel and switch to another. CSIRO describes this continuous distribution of entangled photons as what makes the system spoof-proof. Jamming floods a receiver so the satellite signal cannot get through, whereas spoofing transmits a false signal that pushes a receiver into accepting the wrong time or location, according to Australian Defence Magazine. Both work because conventional GNSS signals reach the ground too weak to defend themselves.
Meanwhile, CSIRO Technical Lead Matt Broome called the result “a significant milestone in the development of quantum-secure time transfer in Australia.” The work began with Heriot-Watt University in Scotland, whose source design CSIRO moved from the laboratory into hardware that runs at an optical ground station.
Uses beyond military
CSIRO created the Quantum Light Source for the Australian Defence Force, but the same satellite timing synchronizes power grids, financial networks, transport systems, and emergency services. The agency also frames the project as building sovereign know-how in quantum components, an area where Australia wants to make the parts instead of importing them.