Over the last decades, digital information processing progressed at an enormous speed. It already becomes an indispensable resource both in science and in society. However, for some computational problems, no efficient algorithms are known yet. If quantum mechanical systems are used for information process, an exponential speedup will be obtained for some of these problems instead of today's classical computers. Among the many different physical systems that have been proposed as carriers of quantum information, nuclear and electronic spins have so far been the most successful candidates. The main challenge remains to be the combination of the spins into scalable quantum registers with hundreds or thousands of spins. The picture shows a particularly interesting candidate: the information would be stored in the nuclear spin of nitrogen or phosphorus atoms (blue spheres), which are stored in the center of C₆₀ molecules. The molecules form nanometer-sized traps for the neutral atoms and thus make it possible to arrange them in predefined patterns, e.g. as rows on a silicon surface. More details could be found in the article “Spin qubits for quantum simulations” by Xin-hua PENG (彭新华) and Dieter SUTER, pp 1－25. [Photo credits: Prof. Dieter SUTER (Fakultät Physik, Technische Universität Dortmund, Germany)]