Based on what I've heard, I don't think the bar is as high as "formally proven to lack a classical solution" for the whole field. Then again, the caveat is of t

Based on what I've heard, I don't think the bar is as high as "formally proven to lack a classical solution" for the whole field. Then again, the caveat is of the two people I know, one is doing cryptography/security in a quantum setting and the other is working on quantum related HW... so take this with as much salt as needed.