Current experiments in liquid-state nuclear magnetic resonance quantum computing are limited by low initial polarization. To address this problem, we have investigated the use of optical pumping techniques to enhance the polarization of a 2-qubit NMR quantum computer (13C and 1H in 13CHCl3). To efficiently use the increased polarization, we have generalized the procedure for effective pure state preparation. With this new, more flexible scheme, an effective pure state was prepared with polarization-enhancement of a factor of 10 compared to the thermal state. An implementation of Grover's quantum search algorithm was demonstrated using this new technique.
@article{arxiv.quant-ph/0105147,
title = {Non-thermal nuclear magnetic resonance quantum computing using hyperpolarized Xenon},
author = {Anne S. Verhulst and Oskar Liivak and Mark H. Sherwood and Hans-Martin Vieth and Isaac L. Chuang},
journal= {arXiv preprint arXiv:quant-ph/0105147},
year = {2009}
}