Could a new breakthrough mean Rigetti is closer to the finish line?Shares of Rigetti Computing (RGTI -1.47%) jumped this week. The quantum computing start-up's stock rose 9.3% from last Friday's close. The move came as the S&P 500 and the Nasdaq-100 rose 2.4% and 3.7%, respectively.Rigetti and other quantum stocks were lifted this week by news that researchers at the University of Southern California may have found a way around obstacles the technology faces in its development.A "rescued" particle could boo ...