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.
@article{arxiv.quant-ph/9905041,
title = {Realization of logically labeled effective pure states for bulk quantum computation},
author = {Lieven M. K. Vandersypen and Costantino S. Yannoni and Mark H. Sherwood and Isaac L. Chuang},
journal= {arXiv preprint arXiv:quant-ph/9905041},
year = {2009}
}
Comments
PRL 83, 3085 (1999). Small changes made to improve readability and remove ambiguities