In science, decades can pass between a proposed theory and its real-world application. That is precisely what University of Washington mathematics professor Gunther Uhlmann was expecting when he and three colleagues proposed a means to develop an electromagnetic wormhole in a 2007 paper in Physical Review Letters. Their theoretical wormhole — an invisible tube for electromagnetic fields — would cloak an electromagnetic field while it passed through the tube, creating a “secret” connection between the entry and exit point. Uhlmann…
October 29, 2015