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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.



polariton
                condensation



Collective quantum states of matter and light in open systems

  • Dyamic condensation and lasing of polaritons in III-As and III-N 2D planar microcavities.
  • Dispersion and spin engineering of polaritons.
  • Collective coherence of polaritons in low-dimensional and in coupled hybrid photonic crystal cavities.
  • Lattice cavity quantum electrodynamics
QD array
Single
                  QD vs. QW PL   

Quantum photonics & plasmonics with wide bandgap materials

  • Spectroscopy of site-controlled single (In)GaN quantum dots.
  • High temperature single photon generation from site controlled quantum dots.
  • Ultrafast indistinguishable single photons via plasmonic enhancement.
  • Single- and few-emitter QED.
image of optical vortices
a compact OAM
                  spectrometer

Optical vortices

  • Generation and propagation of high purity optical vortices.
  • High fidelity, compact optical vortex sorters.
  • High-dimensional quantum information processing with optical vortices.