Navigation quantum sensor being tested in Greenland

Researchers from DTU (Technical University of Denmark) are collaborating with the French company ONERA to develop a quantum sensor for measuring accelerations. Test flights will be conducted in Greenland using a Twin Otter aircraft equipped with the quantum sensor to document its accuracy in determining the Earth's gravitational field. Additionally, the researchers will test quantum-based navigation systems as an alternative to GPS in crisis situations where satellite navigation may be jammed. The quantum sensor, similar to an accelerometer, contains rubidium atoms cooled to near absolute zero, and their movements reflect the Earth's gravity and the aircraft's accelerations, which are registered using lasers. The project is part of the Green Quantum initiative, co-funded by the Danish Ministry of Defence, and the results will contribute to the ADEQUADE (Advanced, Disruptive and Emerging QUAntum technologies for DEfence) project, funded by the European Defence Fund, focusing on quantum methods for future quantum warfare. The collaboration aims to reduce the size of quantum sensor technology from its current large scale to a chip-sized sensor. DTU has previously demonstrated the use of quantum sensors for measuring variations in the Earth's gravitational field and aims to utilize quantum gravimetry for climate change monitoring and geodynamic studies. The test flights in Greenland will enable the collection of data to improve altitude measurements, enhance quantum navigation correction, and contribute to the development of improved gravity maps for precise navigation. Quantum navigation, if miniaturized, could be used in various applications, including buildings, underground environments, and submarines. Furthermore, quantum accelerometers can enhance satellite measurements related to climate change, such as ice melting and sea level rises, by measuring changes in the gravitational field. DTU is participating in the CARIOQA project, a parallel EU initiative, to develop technology for a future European quantum satellite mission.