Chip-scale source of photonic entanglement

Photonic entanglement is essential to many areas of research, including quantum key distribution, quantum teleportation and linear quantum computing. Typical sources of photonic entanglement rely on 2nd or 3rd order optical nonlinear processes. These sources are inherently probabilistic, so to avoid unwanted multiphoton events they must be operated at very low mean photon number probabilities. Source-multiplexing offers a path around this problem allowing operation much close to the ideal of on demand emission. We present our recent development of chip-scale devices for photonic entanglement.