Solid-State Defect Qubits

NV centers, silicon vacancy centers, and other color centers in diamond and silicon carbide

Trapping Technique

1. Point defects naturally embedded in crystal lattice during growth or implantation
2. NV centers: nitrogen atom adjacent to vacancy in diamond lattice
3. Silicon vacancy centers: missing silicon atom in diamond or SiC
4. Defects are fixed in crystal structure; no external trapping needed
5. Can operate at room temperature due to weak coupling to phonons
6. Individual defects can be addressed using focused laser or microwave fields

Gate Mechanism

1. Single-qubit gates via microwave pulses resonant with spin transitions
2. Optical pulses can initialize and read out qubit states
3. Electron spin resonance (ESR) drives electron spin rotations
4. Nuclear spin gates use radiofrequency pulses for nuclear spin qubits
5. Two-qubit gates via dipole-dipole interaction between nearby defects
6. Optical coupling can create entanglement between distant defects
7. Photon-mediated gates enable quantum networking applications