A quantitative model for the effective decoherence of a quantum computer with imperfect unitary operations

Details A quantitative model for the effective decoherence of a quantum computer with imperfect unitary operations A quantitative model for the effective decoherence of a quantum computer with imperfect unitary operations

2003-10-24

arxiv.org/abs/quant-ph/0310152v2

Phys. Rev. A 69, 042310 (2004)

Physics

Quantum Physics

15 pages, 10 figures; only minor corrections, one reference added. This is the version accepted for publication

Scientific paper

10.1103/PhysRevA.69.042310

The problem of the quantitative degradation of the performance of a quantum computer due to noisy unitary gates (imperfect external control) is studied. It is shown that quite general conclusions on the evolution of the fidelity can be reached by using the conjecture that the set of states visited by a quantum algorithm can be replaced by the uniform (Haar) ensemble. These general results are tested numerically against quantum computer simulations of two particular periodically driven quantum systems.

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