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**Quantum computing and Nanoscale "CAD"**

Reading a book on Nanotechnology and venture capitalist Steve Jurvetson makes the statement that traditional computer aided design, like one might use to test an airplane wing design, is not powerful enough to work at the quantum level in designing nanoscale systems. He writes:

"Although scientists have known for 100 years how to write down the equations an engineer needs to solve in order to understand any quantum system, no computer has ever been built powerful enough to solve them. Today's supercomputers choke on any system larger than a water molecule"

he goes on to say, without much elaboration that quantum computing can easily handle these sorts of problems resulting in "an exact prediction of how a system will behave in nature - something that is literally impossible for a traditional computer, no matter how powerful"

Question is what is he specifically referring to that is so computationally intensive and what is it about quantum computing that solves the problem so neatly?