Silicon wafers. Quantum computing. Light-based processors. Any way you slice it, scientists say that processor speeds will absolutely max out at a certain point, regardless of how hardware or software are implemented.
Lev Levitin and Tommaso Toffoli, two researchers at Boston University, devised an equation which sets a fundamental limit for quantum computing speeds. According to their studies, a perfect quantum computer can generate 10 quadrillion more operations per second than fastest current processors. They estimate that the maximum speed will be reached in 75 years.