...consider the modeling of a nanosized structure, such as a drug molecule, using conventional (i.e., non-quantum) computers. Solving the Schrodinger Equation (SE), the fundamental description of matter at the QM level, more than doubles in difficulty for every electron in the molecule. This is called exponential scaling, and prohibits solution of the SE for systems greater than about 30 electrons...This restriction makes first-principles modeling of molecular structures impossible, and has historically defined the boundary between physics (where the SE can be solved by brute force) and chemistry (where it cannot, and empirical modeling and human creativity must take over).
Quantum computers are capable of solving the SE with linear scaling exponentially faster and with exponentially less hardware than conventional computers...Results of these virtual reality simulations will be indistinguishable from what is seen in the real world, assuming that QM is an accurate picture of nature.
This type of simulation, by direct solution of the fundamental laws of nature, will become the backbone of engineering design in the nanotech regime where quantum mechanics reigns.