måndag 15 juni 2009
Is Quantum Computing Fiction?
In Chalmers Magasin for Alumni I read about research by Per Delsing and Göran Wendin on quantum computing using qu-bits, supposedly represented by superposed quantum states allowing computations, which are not possible on the computer we know using standard bits restricted to the two values 0 and 1.
Delsing and Wendin report that superposed states of 2-3 qu-bits have been realized but that 10 qu-bits represents a real challenge, not to speak of the thousands or millions needed for real quantum computing. Listen to Quantum Computing: Origins and Directions.
The basic question concerns superposition of quantum states, which is the question if the basic equation of quantum mechanics, Schrödinger's equation, is a linear equation.
I present reflections about this question in my knols on quantum mechanics, leading to the conclusion that Schrödinger's equation for a many-electron system is not linear, indicating that quantum computing is pure fiction. But maybe I am wrong. Would be interesting with some response from experts on quantum mechanics.