Preparation of pseudo-pure states by line-selective pulses in nuclear magnetic resonance

An alternative method of preparing the pseudo-pure state of a spin system f or quantum computation in liquid-state nuclear magnetic resonance (NMR) is demonstrated experimentally. Applying specific line-selective pulses with a ppropriately chosen flipping angles simultaneously and then a field gradien t pulse we acquire straightforwardly all pseudo-pure states for two qubits in a single experiment quite efficiently. The signal intensity from the pse udo-pure state prepared in this way is the same as that of temporal averagi ng. As an example of an application, a highly structured search algorithm - Hogg's algorithm - is also performed on the pseudo-pure state /00) prepare d by the method. (C) 2001 Elsevier Science B.V. All rights reserved.