International researchers have developed a technology that could potentially expand the capabilities of quantum physics experiments in space. The central element is a miniature laser system capable of controlling atoms with high precision under microgravity conditions.
The results of this work, published in the journal Nature Communications, mark an important step forward for future scientific missions dedicated to studying fundamental physical phenomena. Creating a Bose-Einstein condensate (BEC) itself requires extreme conditions close to absolute zero. In such a state, the effects of quantum mechanics cease to be limited to microscopic scales and can be observed much more broadly.
This is the problem the team solved using the MAIUS-B equipment. Researchers were able to create a mixture of rubidium and potassium during tests conducted in microgravity conditions at the Leibniz University's Einstein Lift in Hanover. To achieve this result, scientists from Johannes Gutenberg University Mainz (JGU), Humboldt University Berlin, and the Ferdinand Braun Institute developed a compact optical system.
Although the equipment included twice as many lasers and additional components, it maintained almost the same volume and payload mass. The team's task was to create optical interfaces between the laser modules and the vacuum system, which are critical for cooling and manipulating atoms.
Andre Wenclevski, a researcher from the JGU Physics Institute, noted that a significant part of the equipment's stability depends on optical tables made of Zerodur—a glass-ceramic known for its extremely low coefficient of thermal expansion. This feature helps maintain laser alignment even during intense launch vibrations and temperature fluctuations.
Key achievements include Wenclevski's assertion that 'this stability is crucial for maintaining precise control over atoms under extreme mechanical loads during rocket launch and at varying temperatures.' The developed technology will serve as the basis for the BECCAL atomic laboratory—a joint project by Germany and the USA planned for operation on the International Space Station (ISS). Quantum sensors are expected to be used to compare the behavior of different atomic species during free fall and to test Einstein's equivalence principle with unprecedented accuracy.
Beyond demonstrating that compact equipment can perform extremely complex experiments, this work highlights an important trend: increasingly sophisticated quantum equipment is heading into space missions. If future projects confirm this potential, researchers will gain new tools for studying some of the most fundamental principles of physics.