WASHINGTON—Amazon.com Inc, Google, and Microsoft Corp are expected to join a Biden administration conference on Tuesday focused on quantum technologies as the U.S. government works to head off hacking threats and corner a burgeoning growth industry. The White House’s Office of Science and Technology Policy (OSTP) is hosting the event that will discuss critical applications…

Microsoft’s near-acquisition of social media app TikTok last year was the “strangest thing I’ve ever worked on,” Chief Executive Officer Satya Nadella said on Monday. TikTok had been ordered by then-President Donald Trump to separate its U.S. version from Chinese parent ByteDance because of national security concerns about the collection of U.S. users’ data. Microsoft…