Linearity and Quantum Adiabatic Theorem

Details Linearity and Quantum Adiabatic Theorem Linearity and Quantum Adiabatic Theorem

2007-01-19

arxiv.org/abs/quant-ph/0701135v2

Physics

Quantum Physics

4 pages, 1 figure. comments are welcome

Scientific paper

We show that in a quantum adiabatic evolution, even though the adiabatic approximation is valid, the total phase of the final state indicated by the adiabatic theorem may evidently differ from the actual total phase. This invalidates the application of the linearity and the adiabatic approximation simultaneously. Besides, based on this observation we point out the mistake in the traditional proof for the adiabatic theorem. This mistake is the root of the troubles that the adiabatic theorem has met. We also show that a similar mistake remains in some recent modifications of the traditional adiabatic theorem attempting to eliminate the troubles.

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