I just cite one line for your reference because I cannot say better:
....I still did not make up my mind about whether this thing [quantum computer] will change the world or whether it will be a phenomenal flop. I just fear that the probability of the latter outcome is orders of magnitude higher than that of the former one.....
However, do not forget that quantum cryptography has become a usable technique in industry because it is much simpler and much less demanding.
However-however, the original belief that quantum cryptography is absolutely safe has turned to be too optimistic. It can be eavesdropped.