This record could be tough to beat. I mean, how much smaller can you get? An international group of United States and Australian researchers have created what they call the smallest possible controllable transistor: It’s only an atom large. Heralded as a major step toward ushering in an era of next-generation quantum computing, the researchers created the transistor using only a single phosphorus atom. “We can’t make it smaller than this,” claimed Purdue researcher Gerhard Klimeck.