Title：Squeezing and entanglement for optical fields through the interaction with atomic ensembles
Speaker：Prof.Rui-Guang Li
Host：Prof. Jie-Tai Jing
Time：02:00 pm, January 18, 2018
Venue：Room A814, Science Building, ECNU Zhongbei Campus
Biography：
Ray-Kuang Lee received his BS degree from the department of Electrical Engineering, National Taiwan University (EE/NTU) in 1997, and his MS and PhD degrees from the Institute of Electro-Optical Engineering, National Chiao Tung University (IEO/NCTU), in 1999 and 2004, respectively. He worked as an assistant scientist at the National Center for High-Performance Computing, Taiwan, from 2001 to 2004, and as a visiting fellow at The Australian National University (ANU), Australia, in 2004. After his graduation, he continued staying in IEO/NCTU as a postdoctoral fellow in 2005. Then, he joined the department of Electrical Engineering and Institute of Photonics Technologies, National Tsing-Hua University (NTHU) as a faculty member at Aug. 2005, where he established the TheoreticalOptics Group dedicated to the establishment of theory for optical solitons and vortices in nonlinear systems, slow-light optics, Bose-Einstein condensates, and quantum memory. Currently, he is also an adjunct Professor in the department of Physics, National Tsing-Hua University, the affiliate Scientist of the Physics division, National Center for Theoretical Science, for the research areas in Atom-Molecular-Optics/Interdisciplinary Physics, and was a visiting fellow at the Max-Planck Research Group at Erlangen University, Germany (2006), the Australian National University, Australia (2007, 2010), and Kansas State University, United State (2009).
Dr. Lee’s research was recognized as an interdisciplinary work to the societies from theoretical physics, applied photonics, to laser engineering, and due to his contributions, he received the Young Investigator Award from the Academic Sinica, Taiwan (2012), Wu Ta YouMemorial Award from the National Science Council, Taiwan (2011), the Outstanding YoungElectrical Engineering Award from the Chinese Institute of Electrical Engineering (2010), the Young Theoretical Physician Award from the National Center for Theoretical Science, Taiwan (2010), the Young Optical Engineer Award from the Optical Engineering Society of ROC (2009), the Y. Z. Hsu Scientific Paper Award from the Far Eastern Y. Z. Hsu Science and Technology Memorial Foundation (2010), and the Exploration Research Award from the Pan Wen Yuan Foundation (2009).
Dr. Lee’s group has strong collaborations with several groups worldwide, including Australia, Israel, Russia, Italy, Pakistan, and China. He has published more than 100 technical journal papers, with total citation > 1600 and H-index = 20. His work Quantum Phase Transitions of Light for Two-level Atoms, was selected as one of “Optics in 2008” by the Optical Society of America (OSA); Absolute frequency of cesium 6S-8S hyperfine transition by two-photon interfered spectrum, Opt. Lett. 38, 3186 (2013), was selected as Spotlight onOptics; Local PT symmetry violates the no-signaling principle, Phys. Rev. Lett. 112, 130404 (2014), was selected as Editors' Suggestion and as Featured in Physics.
Abstract of the talk：
By taking quantum effect of atomic ensembles into account, through interaction with two-level systems, noise squeezing and quantum correlations in self-induced transparency (SIT) solitons are revealed with the contribution from field continuum parts and the atomic fluctuations. For three-level systems in the electromagnetically-induced-transparency (EIT) configuration, influences on the degradation of quantum noise squeezing from the optical depth of atomic ensemble, the strength of control field, and ground-state DE coherence are studied in the slow light, as well as storage and retrieval, for a squeezed probe pulse. Moreover, we propose to utilize the effect of coherent population trapping (CPT) to directly generate squeezed light without any optical cavity, as a new avenue in the generation of squeezed light for the quantum interface.
References:
[1].Ray-Kuang Lee and Yinchieh Lai, Quantum squeezing and correlation of self-induced transparency solitons, Phys. Rev. A 80, 033839 (2009).
[2].Yinchieh Lai and Ray-Kuang Lee, Entangled quantum nonlinear Schrodinger solitons, Phys. Rev. Lett. 103, 013902 (2009)
[3].You-Lin Chuang and Ray-Kuang Lee, Conditions to preserve quantum entanglement of quadrature fields in electromagnetically induced transparency media, Opt. Lett. 34, 1537 (2009).
[4].You-Lin Chuang, Ite A. Yu, and Ray-Kuang Lee, Quantum theory for pulse propagation in electromagnetically-induced-transparency media beyond the adiabatic approximation, Phys. Rev. A 91, 063818 (2015)[5]. You-Lin, Chuang, Ray-Kuang Lee, and Ite A. Yu, Optical Density-Enhanced Squeezed Light Generation without Optical Cavities, Phys. Rev. A 96, 053818 (2017).
