BACK OF ENVELOPE. “Assuming 7.1 microtubules per square μm and 768.9 μm in average length and that 1/30 of brain volume is neurons (although given that microtubule networks occurs in all cells, glia – and any other cell type! – may count too) gives 10(16) microtubules. If each stores just a single quantum bit this would correspond to a 10(16) qubit system, requiring a physically intractable 2(10)^16 bit classical computer to emulate. If only the microtubules inside a cell act as a quantum computing network, the emulation would have to include 10(11) connected 130,000 qubit quantum computers.”
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