[rdl]

There's been a lot of "physically unclonable function" work, which IMO is a lot more useful for DRM and anti-counterfeiting than for encryption.

The big weakness with OTPs is inadvertent key reuse, not someone stealing the key wholesale.

Even with quantum computing, conventional OTPs are fine, provided keys aren't reused (or lost). OTOH there are plenty of other more efficient symmetric and asymmetric systems which are still fine under quantum computing, too. (it's really not much of an issue for conventional symmetric cryptography; yes, most common public key systems in use today fall to quantum cryptography, but their are known/viable systems which would be fine)