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

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

1999-11-16

arxiv.org/abs/quant-ph/9911072v1

New J. Phys. 2 6.1-6.12 (2000)

Physics

Quantum Physics

8 pages RevTex including 7 PostScript figures (18 subfigures)

Scientific paper

10.1088/1367-2630/2/1/006

We implement an ensemble quantum counting algorithm on three NMR spectrometers with 1H 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.

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