21. Applying such a pulse to a set of nuclear spins simultaneously excites all the single-quantum NMR transitions. 22. Wu's experiment compared the distribution of gamma and electron emissions with the nuclear spins in opposite orientations. 23. These include molecules in which the quantum states of electron and nuclear spins can be controlled with exquisite precision. 24. Nuclear spin is best known for its crucial role in the NMR / MRI technique for chemistry and biochemistry analysis.25. Wu's observation was that more ?-rays were emitted in the opposite direction to the nuclear spin . 26. This type of emission ( Gamow-Teller transition ) changes nuclear spin by a unit of 1 to compensate. 27. These fluctuations produce transitions between the nuclear spin states in a similar manner to the magnetic dipole-dipole interaction. 28. It is this magnetic moment that allows the observation of NMR absorption spectra caused by transitions between nuclear spin levels. 29. Observations of the energy levels of atoms and molecules were inconsistent with the nuclear spin expected from proton electron hypothesis. 30. Yet it is possible to use the 29 Si nuclear spin of the SiV as a qubit for quantum information applications.
