As part of an update to the national fingerprint database, the FBI has begun rolling out facial recognition to identify criminals. (newscientist.com)
It's never stored on Apple servers, it's never backed up to iCloud or anywhere else, and it can't be used to match against other fingerprint databases. (support.apple.com)
One such quantum algorithm, called Grover's search, speeds up searches, such as scanning fingerprint databases for a match. (sciencenews.org)