Research

Quantum Integrated photonics

Photon plays a central role in future quantum technology. The rapid growth of quantum technology has raised the requirement for complex and efficient control of photons at large scale. Integrated photonics provides the ideal platform for this task, providing high phase stability, power efficiency, and system scalability. However, most nanophotonic materials do not have intrinsic second-order nonlinearity, which is critical for quantum technology. We have developed novel nanophotonic materials with strong second-order nonlinearity. Quantum state generation and manipulation have been demonstrated. We will continue to develop quantum nanophotonic devices with different capabilities based on these nonlinear nanophotonic materials. Furthermore, we will integrate components with different functions into large-scale systems for quantum applications.

Piezo-optomechanics

We explore the mutual interaction among microwave, mechanics, and optics through piezoelectric and optomechanical effects. The complex multi-mode configuration and strong interaction have provided numerous possibilities for both fundamental research and practical applications. The system can be configured to control optics with microwave signals in spatial, temporal, and frequency domains. The mechanical enhancement leads to order-of-magnitude improvement in power efficiency compared with electro-optic effect. The system can also be configured to convert quantum states between microwave and optical photons with mechanics serving as the transducer. Quantum-limited sensing of mechanical motion and microwave signals can be realized based on piezo-optomechanical systems as well.