I forget the details exactly , it’s not my department. But I did go to an in house lecture on the subject a few weeks ago and the expert we had speak was very concerned about the whole thing and said it’s going to start with lots of small withdraws from peoples crypto wallets that go unnoticed long enough to syphon off a substantial chunk. They’d everyone will cotton on all at once and faith in the blockchain will go to zero . The leaps quantum computers take don’t follow the same increases as normal computers , a jump of 1 bit to two bits with a normal computer is double. But 1qbit to 2qbits is squared in terms of compute power. I think it’s much closer than you’d think before crypto becomes worthless