Scientists already believe that diamonds could be a solid foundation for practical quantum computers. You can use atom-scale defects in diamond to store quantum bits that hold contradictory data (say, both on and off) in a way that lets you read the data without the risk of changing it. But there's a problem. The most common defect, where nitrogen atoms replace carbon atoms, emits such a broad range of light that it's too inaccurate to be useful. However, a team of researchers may have a way to keep those inaccuracies to a minimum: slip in some silicon, which emits a much narrower range of light.