The Download: a useful quantum machine and a record-breaking subsea tunnel

This is today’s edition of The Download , our weekday newsletter that provides a daily dose of what’s going on in the world of technology. PsiQuantum has a plan to make a massive quantum computer out of light The machine that could change the world will be housed in a room that looks like a data center crossed with an ice cream factory. Inside, some 100 stainless-steel cabinets each hold hundreds of chips.