We are fast approaching the physical limitations of silicon based technology. Carbon nanotubes offer advantages over silicon, but we face major obstacles in producing competing solutions. If we can figure it out, carbon nanotubes could be the foundation for silicon replacement, and then some time thereafter, affordable quantum computing.
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The new tech of carbon nanotubes and graphene can produce computing abilities far greater than silicon can. Our current limitations are in fast and reliable production of the materials. When we break through those barriers, amazing things will happen!