Our group works on generating a variety of quantum states of light with bright coherent laser fields. Multi-partite entanglement, squeezed light and superposition states that we generate are then used for probing new physics and for quantum information applications.

The squeezed state of light has very interesting quantum noise properties. When its quadrature amplitude is measured, the measurements will show that it can be quiet than the optical “vacuum”. In our lab, we can significantly reduce this vacuum fluctuations by much more than 90% (>10 dB). This extremely quiet laser beam can be turned into an ultra-precision sensor. For example, it was used in a Michelson interferometer setup in the LIGO interferometer for detecting cosmic gravitational waves. Combining squeezed light on beamsplitters allows us to generate multi-partite entanglement that is a useful resource for photonic quantum computing. By introducing photon number resolving detection our system, non-Gaussian quantum states can also be generated. Our group uses these light sources for a range of quantum applications, including quantum computing, encryption, interferometry, metrology, levitation and communications.

Our research is carried out both at A*STAR’s Institute of Materials Research and Engineering (IMRE) and at the Centre for Quantum Technologies at NUS. We are looking to recruit new members to join our research.