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A quantum computer has been launched into space for the first time, marking a significant milestone led by physicists at the University of Vienna. The team, headed by Philip Walther, developed a photonic processor designed to process raw satellite data directly in orbit before it is sent back to Earth. This approach aims to solve long-standing bandwidth bottlenecks that slow down global communication.

The device was launched aboard a SpaceX Falcon 9 rocket on June 23, 2025, into low Earth orbit. It consists of a photon-pair source, a glass circuit chip, detectors, and control electronics. The system works by using lasers to create pairs of light particles called photons, which travel through microscopic heaters and are measured by sensitive detectors. However, the mission faced an immediate challenge: half of the original six photon detectors failed after launch, leaving only three operational.

Despite this setback, the processor successfully generated, manipulated, and detected photon pairs over eight months in space. Researchers observed two-photon interference, a quantum phenomenon where light particles interact in specific ways, even under harsh conditions like radiation and temperature shifts. The study, published on arXiv by Simon Steiner et al., notes that while this is a successful first step, future satellites must encode Earth-observation data directly into the circuit to fully close the loop between sensors and processors.