Isolated electron spins in silicon carbide with millisecond-coherence   times
  The elimination of defects from SiC has facilitated its move to the forefront of the optoelectronics and power-electronics industries. Nonetheless, because the electronic states of SiC defects can have sharp optical and spin transitions, they are increasingly recognized as a valuable resource for quantum-information and nanoscale-sensing applications. Here, we show that individual electron spin states in highly purified monocrystalline 4H-SiC can be isolated and coherently controlled. Bound to neutral divacancy defects, these states exhibit exceptionally long ensemble Hahn-echo spin coherence, exceeding 1 ms. Coherent control of single spins in a material amenable to advanced growth and microfabrication techniques is an exciting route to wafer-scale quantum technologies. 
David J. Christle, Abram L. Falk, Paolo Andrich, Paul V. Klimov, Jawad   ul Hassan, Nguyen T. Son, Erik Janz\'en, Takeshi Oh...
cond-mat.mes-hall cond-mat.mtrl-sci quant-ph