First functional optical quantum processor operates in orbit.

An international team led by the University of Vienna, with participation from the CNR and Politecnico di Milano, has demonstrated for the first time the operation in orbit of a light-based quantum processor. The prototype, launched aboard a satellite in June 2025, succeeded in performing operations despite the technical difficulties of the space environment.

The processor, designed to withstand vibrations, thermal variations, and radiation, operated at an altitude of 510 kilometers. Although only three of the six detectors were usable and sunlight created strong noise, the device produced and controlled the quantum behavior of photons necessary for computation. The result, shared on the arXiv platform, represents a step toward space-based quantum computers for processing satellite data directly in orbit.

Quantum computers leverage the laws of quantum physics to perform calculations impossible for traditional computers. Unlike classical bits (0 or 1), quantum qubits can be in a superposition of states, allowing them to process vast amounts of data simultaneously. This technology, developed in terrestrial laboratories, promises revolutions in cryptography, drug discovery, and climate modeling.

Bringing this technology into space represents an enormous challenge due to the extreme environment: launch vibrations, extreme temperatures, cosmic radiation, and interfering sunlight. The ultimate goal, pursued for years by space agencies and research centers, is to process satellite data directly in orbit, reducing the need to transmit huge volumes of information to Earth. This optical prototype, which uses photons instead of superconducting qubits, was specifically designed to survive these conditions, paving the way for future satellite constellations with quantum computing capabilities.