Actually D-wave supposedly managed 512-Qubits. 128-bit keys are still safe though. In order for it to be cost effective to brute force a 128-bit key, and given that 80-bit keys are vulnerable now, each quantum evaluation of a cryptographic algorithm must be no more expensive than 2^16 that of a classical computation.
On Sun, Jan 25, 2015 at 12:45 PM, Ron Garret <r...@flownet.com> wrote: > Far. The state of the art in quantum computing hardware is a small > handful of qbits. I think the current record is three or four, and the > engineering challenges grow more daunting as the number grows. It might > turn out that practical quantum computing is in fact not possible. But if > that’s the case, the limiting factor is not yet know, so one should not be > too complacent. If the history of technology teaches anything it is that > anything that is not impossible is inevitable. > > rg >
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