the better five-year-old explanation is that quantum computers can perform vast numbers of 'computations', but can only report one result it's a new and tricky

the better five-year-old explanation is that quantum computers can perform vast numbers of 'computations', but can only report one result it's a new and tricky mathematical problem to get that 'one result' to be anything useful, but from what i understand they are confident in their algorithms for breaking ECC wide open, given modest quantum hardware