Method of multifrequency excitation for creating pseudopure states for NMRquantum computing - art. no. 020301

An alternative method of preparing pseudopure states for NMR quantum comput ing is presented. The method involves population transfer by the use of a m ultifrequency excitation pulse. The system studied was a spin-7/2 nucleus ( Cs-133) in a liquid-crystalline environment. It is shown that all eight pse udopure quantum states for this three-qubit system can be prepared by using only 1-3 pulses, while the intensities of the relevant peaks increase by a factor of up to 4 compared to the equilibrium NMR spectrum. A comparison o f the intensity enhancement by population transfer for quadrupolar nuclei a nd that for coupled spin-1/2 systems is given.