Abstract: In this talk, I shall give a presentation of our recent researches on the quantum squeezing of slow-light solitons in coherent atomic systems working under the condition of electromagnetically induced transparency (EIT). Starting from Heisenberg-Langevin-Maxwell equations governing the quantum dynamics of atoms and probe laser field in three-level atomic systems, we derive a quantum nonlinear Schrödinger equation controlling the evolution of the probe-field envelope. By diagonalizing effective Hamiltonian via Bogoliubov transformation, we carry out detailed calculations on quantum fluctuations of slow-light solitons, which are expanded as a superposition of the complete and orthonormalized fluctuation eigenmodes, obtained by solving Bogoliubov-de Gennes equations. We show that due to the giant Kerr nonlinearity induced by the EIT significant quantum squeezing of both bright and dark solitons can be realized within a very short propagation distance. We also show that it is possible to realize simultaneous quantum squeezing of light polarizations and atomic spins in a cold atomic gas with tripod-type four-level atomic system through a double EIT. The results reported here are beneficial for understanding the quantum property of slow-light solitons and for realizing quantum squeezing of light and atomic spins via EIT.

主讲人简介：黄国翔，1991年获复旦大学博士学位，1992年晋升为华东师范大学副教授，1994年晋升为华东师范大学正教授。曾任西班牙马德里大学、德国马克斯普朗克研究所、法国巴黎大学、意大利国际理论物理中心、美国国家标准与技术研究院、美国纽约大学等单位的客座教授和访问学者。目前主要研究方向为冷原子物理和量子非线性光学。发表研究SCI论文200余篇（其中Physical Review 系列100余篇）。曾任华东师范大学物理系副系主任、系主任、精密光谱科学与技术国家重点实验室副主任。现任纽约大学-华东师范大学联合物理研究所中方所长、上海市非线性科学学会理事长。