Il. Chuang et al., BULK QUANTUM COMPUTATION WITH NUCLEAR-MAGNETIC-RESONANCE - THEORY ANDEXPERIMENT, Proceedings - Royal Society. Mathematical, physical and engineering sciences, 454(1969), 1998, pp. 447-467
Citations number
30
Categorie Soggetti
Multidisciplinary Sciences
Journal title
Proceedings - Royal Society. Mathematical, physical and engineering sciences
We show that quantum computation is possible with mixed states instead
of pure states as inputs. This is performed by embedding within the m
ixed state a subspace that transforms like a pure state and that can b
e identified by labelling based on logical (spin), temporal, or spatia
l degrees of freedom. This permits quantum computation to be realized
with bulk ensembles far from the ground state. Experimental results ar
e presented for quantum gates and circuits implemented with liquid nuc
lear magnetic resonance techniques and verified by quantum state tomog
raphy.