Quantum technologies exploit the unusual properties of the most fundamental building blocks of matter. They promise breakthroughs in communication, computing, sensors and much more. However, quantum states are fragile, and their effects are difficult to grasp, making research into real-world applications challenging. Empa researchers and their partners have now achieved a breakthrough: Using a kind of “quantum Lego”, they have been able to accurately realize a well-known theoretical quantum physics model in a synthetic material.