My current research interests are fundamentals and applications of quantum coherence, focusing on quantum coherence and decoherence, quantum sensing, quantum computing, and foundation of quantum physics. The specific research topics include
1. understanding and combating decoherence of quantum objects in realistic environments - a critical issue in quantum information processing and a fundamental question in quantum mechanics;
2. quantum many-body theory on dynamics in complex quantum systems (such as spins in a complex network), including the patterns and flow pathways of quantum entanglement and correlations, using cluster-correlation expansion, tensor-network techniques, machine-learning algorithms, and exact numerical simulation;
3. quantum sensing - exploiting quantum coherence for ultra-sensitive detection and high-precision measurement, especially quantum coherence of nitrogen-vacancy center spins in diamond or similar systems for single-molecule nuclear magnetic resonance and atomic scale magnetic resonance imaging, bio-sensing, detection of quantum many-body physics, and loophole-free test of the quantum foundation;
4. topological phenomena in quantum optics and in extreme nonlinear optics, especially quantum simulation of topological condensed matter physics using Fock-state lattices in atom-photon coupled systems, measurement of geometric quantum phases using high-order sideband generation in condensed matter systems under strong terahertz field, and quantum many-body correlations in superradiance masers.
(R.B. Liu)
Localized surface plasmon resonance endows metal nanoparticles with rich and fascinating optical properties, including controllable plasmon wavelengths, extremely large scattering/absorption cross-sections, strong light confinement, and hot charge carrier generation. These properties in turn allow metal nanoparticles to be used in a wide range of applications. We are intensively studying the properties of various metal nanoparticles, understanding their interactions with other optical species, and exploring their applications in optics, spectroscopy, sensing and photocatalysis.
(T.H. Chow | J.F. Wang)
Recently solid state qubits especially single defects in solids emerge as one of the promising candidates for realizing quantum information technology. We are studying the physics properties of these qubits and exploring these potential for different applications. For example, we are working of building quantum nodes with nitrogen vacancy centers in diamond.
(S. Yang)
Production and investigation of molecular quantum gases with strong dipolar interactions. Studies of a double-species Bose-Einstein condensate with tunable interactions.
(D.J. Wang)
Broad band spectroscopy studies of qubits in solid state systems. Investigation of quantum manipulation, quantum entanglement, quantum decoherence processes. Design and demonstrate quantum optical interfaces for both quantum information networks and quantum computing.
(S. Yang | C.K. Law | R.B. Liu)
Investigation of entanglement in many-body systems; quantification of entanglement, entanglement manipulation, quantum measurement decoherence.
(R.B. Liu | K.M. Cheng | C.K. Law | W.H. Leong)
