Abstract
A connection of the Wigner–Yanase skew information and multiple quantum (MQ) NMR coherences is considered at different temperatures and evolution times of nuclear spins with dipole–dipole interactions in MQ NMR experiments in solids. It is shown that the Wigner–Yanase skew information at temperature T is equal to the double second moment of the MQ NMR spectrum at the double temperature for any evolution times. A comparison of the many-spin entanglement obtained with the Wigner–Yanase information and the Fisher information is conducted.
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