Toward quantum information processing by nuclear magnetic resonance: Pseudopure states and logical operations using selective pulses on an oriented spin 3/2 nucleus

Nuclear magnetic resonance spectroscopy has demonstrated significant experi mental progress toward the development of quantum computations. The develop ments so far have taken place mainly through the use of spin 1/2 nuclei. In this paper we describe the use of a spin 3/2 nucleus, oriented in a liquid crystal matrix for the creation of pseudopure states and the implementatio n of a complete set of two-qubit reversible logic gates using single-quantu m transition-selective pulses, extending the range of practice of NMR towar d quantum computation. (C) 2001 American Institute of Physics.