Realization of logically labeled effective pure states for bulk quantum computation
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We report the first use of "logical labeling" to perform a quantum computation with a room-temperature bulk system. This method entails the selection of a subsystem which behaves as if it were at zero temperature - except for a decrease in signal strength - conditioned upon the state of the remaining system. No averaging over differently prepared molecules is required. In order to test this concept, we execute a quantum search algorithm in a subspace of two nuclear spins, labeled by a third spin, using solution nuclear magnetic resonance (NMR), and employing a novel choice of reference frame to uncouple nuclei.
PRL 83, 3085 (1999). Small changes made to improve readability and remove ambiguities
PRL 83, 3085 (1999). Small changes made to improve readability and remove ambiguities