One frightening aspect of quantum computing is the certainty that the technology will be used to crack previously undecipherable codes and breach previously unhackable systems. Retrieved 1 April Reviews of Modern Physics. Journal of Physics: Condensed Matter. Other problems, including the simulation of quantum physical processes from chemistry and solid-state physics, the approximation of certain Jones polynomials , and the quantum algorithm for linear systems of equations have quantum algorithms appearing to give super-polynomial speedups and are BQP -complete. These are used to protect secure Web pages, encrypted email, and many other types of data. Archived from the original PDF on 10 April Together with researchers from Google, the scientists set out to measure the speed of simulation in one of D-Wave's quantum annealing processors, and found that performance increased with both simulation size and problem difficulty, to reach a million-fold speedup over what could be achieved with a classical CPU.