After trying out algorithmic trading on a quantum computer, HSBC recently joined a growing list of companies to claim that a revolutionary new form of computing was finally coming into its own. The experiment was a “world first in bond trading” that showed “we are on the cusp of a new frontier of computing in financial services”, the bank said.Some quantum experts are not so sure. Scott Aaronson, a professor of computer science at the University of Texas, dismissed it as one of an increasing num...