An intense effort is being made today to build a quantum computer. Instead of presenting what has been achieved, I invoke here analogies from the history of science in an attempt to glimpse what the future might hold. Quantum computing is possible in principle - there are no known laws of Nature that prevent it - yet scaling up the few qubits demonstrated so far has proven to be exceedingly difficult. While this could be regarded merely as a technological or practical impediment, I argue that this difficulty might be a symptom of new laws of physics waiting to be discovered.Yes, I agree with this. I think that building a quantum computer will eventually seen to be like building a perpetual motion machine. Progress is an illusion. Quantum computing is not really possible in principle, as it depends on ideas that have never been empirically demonstrated.
Wednesday, October 26, 2011
Limits to quantum computing
A new paper, Quantum Computing: Theoretical versus Practical Possibility, by G. S. Paraoanu, says: