Bulk quantum computation with nuclear magnetic resonance: theory and experiment

I. L. Chuang, N. Gershenfeld, M. G. Kubinec, D. W. Leung
1998 Proceedings of the Royal Society A  
We show that quantum computation is possible with mixed states instead of pure states as inputs. This is performed by embedding within the mixed state a subspace that transforms like a pure state and that can be identi ed by labeling it based on logical spin, temporal, or spatial degrees of freedom. This permits quantum computation to be realized with bulk ensembles far from the ground state. Experimental results are presented for quantum gates and circuits implemented with liquid nuclear
more » ... ic resonance techniques and veri ed by quantum state tomography.
doi:10.1098/rspa.1998.0170 fatcat:r2szqzchobgppbs5kyofs5h32y