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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Use of composite rotations to correct systematic errors in NMR quantum computation

H K Cummins-+ and J A Jones-+,++

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We implement an ensemble quantum counting algorithm on three NMR spectrometers with 1 H resonance frequencies of 500, 600 and 750 MHz. At higher frequencies, the results deviate markedly from naive theoretical predictions. These systematic errors can be attributed almost entirely to off-resonance effects, which can be substantially corrected for using fully compensating composite rotation pulse sequences originally developed by Tycko. We also derive an analytic expression for generating such sequences with arbitrary rotation angles.


PACS

03.67.Lx Quantum computation architectures and implementations

32.30.Dx Magnetic resonance spectra

Subjects

Atomic and molecular physics

Computational physics

Quantum information and quantum mechanics

Dates

Issue 1 (March 2000)

Received 18 January 2000

Published 30 March 2000



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