-SiC

摘要： The ?ne-structure splitting in zero magnetic ?eld allows one to access the coherent control and manipulation of polarized spin states. Here the zero-?eld splitting (ZFS) of the S = 3/2 silicon vacancy-related centers in 6H-SiC is explored by means of electron paramagnetic resonance and electron nuclear double resonance techniques, combined with ?rst-principle calculations. We show that the centers not only possess signi?cantly different absolute values of ZFS, but they also differ in their sign. This diversity is rationalized by a ?attened/elongated character of their spin-density distribution, potentially alters spin-photon entanglement, and suggests these centers for qubits in the upcoming technology of quantum communication and quantum-information processing.