  By applying a new technique for dynamic nuclear polarization involving
simultaneous excitation of electronic and nuclear transitions, we have enhanced
the nuclear polarization of the nitrogen nuclei in 15N@C60 by a factor of 1000
at a fixed temperature of 3 K and a magnetic field of 8.6 T, more than twice
the maximum enhancement reported to date. This methodology will allow the
initialization of the nuclear qubit in schemes exploiting N@C60 molecules as
components of a quantum information processing device.
