from Single Quanta to Macro Coherence
Quantum mechanics is the language in the microscopic world where single or few particles and quasi-particles are fully described by their complex wavefunctions and a Hermitian system Hamiltonian. When the number of particles grows large, phase correlation among the particles is lost due to interaction with the environment -- and we enter the classical world of human scales. In some special systems, however, phase correlations survive among a macroscopic number of particles over macroscopic distances, and remarkable collective quantum phenomena emerge. Those are the systems that we study.
Earlier examples of such studies have led to tremendous
advances in modern science and technology, such as stimulated
scattering and lasers, Bardeen-Cooper-Schrieffer state and
superconductors, Bose-Einstein Condensation and precision
measurement. Our current interest centers on the discovery,
creation, control and applications of both single quantum state
and collective quantum phenomena in solid and light systems.
Collective quantum states of matter and light in open systems
Quantum photonics & plasmonics with wide bandgap materials