A quantum computer uses bits that are not only 0 or 1, but can be both at the same time. Unfortunately, this quantum information is so fragile, that it is quickly lost. A team of scientists led by QuTech’s Tim Taminiau at TU Delft have now demonstrated for the first time how errors in a quantum calculation can be tracked down and actively repaired, without losing the quantum information. By applying repeated quantum error correction using electron and nuclear spins in diamond, they were able to store sensitive quantum information for longer than without this error correction. Resolving errors in quantum calculations is crucial for the development of a working quantum computer. The scientists published an article about it in Nature Communications on 5 May.