Quantum annealing is the only truly useful quantum computing architecture to date. I further believe that someone will figure out an algorithm that runs on cla

Quantum annealing is the only truly useful quantum computing architecture to date. I further believe that someone will figure out an algorithm that runs on classical computers to match the speed of quantum annealing, thus the Quantum Annealing machines, while currently useful, have a limited shelf life. Shor's algorithm, which runs on Quantum Computers, requires the use of many repeated cycles of small rotations of qubits in the complex plane of the Bloch sphere. These are analog operations that accumulate phase error. It's not possible to use error correction with these operations, as those techniques necessarily sacrifice information in the complex component plane, leaving the real component "corrected".