View larger image | Most current proposals for hybrid quantum computers rely on superconducting circuits to do the information processing. But what material would make the most reliable storage partner is far from clear. Teams around the world are investigating a number of options (some highlighted above) in search of the perfect match; ultimately, the best duo might depend on the problem that is being tackled. Credit: Superconductor background: Magenta10/shutterstock; Atom, semiconductor and cloud: t. dubÉ; Ruby: Laschon Robert Paul/shutterstock; Buckyball: Oksancia/istockphoto; Diamond: Rozaliya/shutterstock