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4月28日学术报告

来源： 发布时间：2014-04-22【字体：大 中 小】

　　题目：Single-cycle squeezing　

　　姓名：Prof. Mikhail Kolobov　　

　　单位：Department of physics, University of Sciences and Technologies of Lille, France　　

    时间：4月28日上午10:00~11:30　　

    地点：2号楼514会议室 　　

报告摘要: Parametric down-conversion of light (PDC) in a quasi-phase-matched (QPM) nonlinear crystal can be spectrally very broad when the spatial frequency of periodic poling is linearly chirped. Present day technologies allow for fabrication of chirped QPM crystals with ultra-large PDC bandwidth comprising the whole optical spectrum. In the low-gain regime this allows for generation of biphotons with correlation time of the order of a single optical cycle. A natural next step is investigation of the properties of the PDC light produced in such crystals in the high-gain regime, known to generate squeezing. Up to now only a classical treatment of high-gain regime was reported in the literature. 

　　In this talk we shall present a full quantum theory of the PDC in QPM nonlinear crystals and demonstrate a possibility of generation of ultra-broadband squeezing comprising the full optical octave. In temporal domain this corresponds to single-cycle squeezed states of light. We shall describe a scheme for observation of this kind of squeezing using second-harmonic generation as an ultrafast optical correlator. We shall also discuss potential applications of such light in ultra-precise optical metrology. 

 　报告人简介: Mikhail Kolobov received his MSc in physics in 1986, PhD in quantum optics in 1989 both from the University of Leningrad, URSS, and DSc in theoretical physics in 1998 from the University of Essen, Germany. Since 2001 he is professor at the department of physics, University of Sciences and Technologies of Lille, France. His main research interests are in theoretical quantum optics, quantum imaging, and quantum information. He is editor of the book “Quantum Imaging” (Springer, NY, 2006). He was Fulbright Visiting Scholar at Stanford University from February to July, 2012. 

 

　                                                      　欢迎参加！ 

                                                       　 所办公室 

　                                                    　2014年4月22日 

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