The U.S. government has taken action against Chinese companies involved in quantum computing and other advanced technologies, putting them in an export blacklist. Washington argues that these firms pose a threat to national interests as they might gain access to American technologies that can end up benefiting the Chinese military. In the trade blacklist released on Nov. 24, the U.S. Commerce Department added 27 new entities from four nations, many of them from China and its ally Pakistan. Some of these institutions are said to be playing a critical role in Pakistan’s missile program and nuclear activities. The blacklist includes...