Interactions in an Electron Spin -Nuclear Bath Coupling solid State Computer Magnetic Field Electron Orbit Crystal lattice Spin orbital· Electron spin← Nuclear sp Nuclear spin Hyperfine: Fermi Contact Dipole-Dipole Dipdle-Dipole Electron spin Dipole-dipoleInteractions in an Electron Spin-Nuclear Bath Coupling Solid State Computer Electron spin Nuclear spin Electron Orbit B Magnetic Field Crystal Lattice Hyperfine: Fermi Contact Dipole-Dipole Spin-orbital Nuclear spin Electron spin Dipole-dipole Dipole-Dipole