Two rising stars in quantum computing are charting vastly different courses to the public trading floor. IQM, a Finnish start-up, moved one step closer to its U.S. stock market debut on Thursday as it filed a registration statement with the Securities and Exchange Commission. IQM earlier this year announced its intention to merge with a blank-check company, Real Asset Acquisition Corp. (ticker: RAAQ), in the latest example of the special-purpose acquisition company, or SPAC, merger craze that has taken the industry by storm.