Narrow-Band Biphotons and Single Photons Abstract: Entangled paired photons, termed biphotons, have become a benchmark tool for quantum optics and played a critical role in quantum information science. In this talk, I will review our recently developed narrow-band biphoton generation using spontaneous four-wave mixing in a cold atomic ensemble with electromagnetically induced transparency. The long temporal coherence time (100-1000 ns) of these photons allows modulating their quantum waveform and correlation in time domain directly. For the first time, using modulated single photons, we observed single-photon optical precursors and verified the information speed limit of a single photon. I will also report our recent work on producing narrow-band hyperentangled paired photons, as well as the demonstration of two-photon quantum interference with nondegenerate paired photons. Biography: Prof. Du is currently an Assistant Professor in The Hong Kong University of Science and Technology. He obtained his PhD in Physics from University of Colorado at Boulder. His research interests include Atom Optics, Quantum Optics, Bose-Einstein Condensation, Atom Chip, Laser Cooling and Trapping, Nonlinear Optics, Solid State Lighting, Superconducting Electronics. |