Implementation of the refined Deutsch-Jozsa algorithm on a three-bit NMR quantum computer - art. no. 022312

We implemented the refined Deutsch-Jozsa algorithm on a three-bit nuclear m agnetic resonance quantum computer. All of the balanced and constant functi ons were realized exactly. The results agree well with theoretical predicti ons and clearly distinguish the balanced functions from constant functions. Efficient refocusing schemes were proposed for the soft z pulse and J coup ling, and it is shown that the thermal equilibrium state gives the same ans wer as the pure state for this algorithm.