Carlo Rovelli at Aix-Marseille University in France doesn’t think the wave function is a real object. He has been working on an alternative idea known as the relational interpretation of quantum mechanics. In this view, everything in existence exists only in relation to other things, including you. A particle is there when you measure it, but doesn’t exist at all times. “To ask what an electron’s momentum is can simply be a meaningless question,” he says.
New Scientist