题目：Wave Particle-Duality with a Single Photon: The Delayed Choice  Gedanken Experiment at Last a Real Experiment
报告人：Prof. Jean-Francois ROCH （法国Ecole Normale Superieure de Cachan）               

摘要：
Wave-particle duality is at the root of the quantum revolution initiated at the beginning of the XXth century, and most textbooks on Quantum Physics start with a description of an "experiment" to demonstrate it. In contrast to common belief, this textbook experiment was only  realized in 1985, after the development of the first source of single photons. The most fascinating scheme of that Gedanken Experiment - the "delayed-choice" experiment that was proposed by J. A. Wheeler - has been recently implemented using single-photon light pulses emitted by a diamond color center. I will present that experiment, which stresses one big "quantum mystery" in the words of Feynman, and I will describe current developments of diamond-based single-photon sources.

Prof. Jean-Francois ROCH 简介：
Jean-Francois Roch was born in 1964. He got his PhD in 1992 at Institut d'Optique in Orsay under the supervision of Philippe Grangier. He was them hired by the CNRS and continued to work at  Institut d'Optique in Orsay in Philippe Grangier's group until 1996. His research topics have been quantum non-demolition measurements and quantum noise manipulation using semiconductor emitters and receivers. He then worked at Ecole Normale Superieure on high-Q silica microspheres in the group of Serge Haroche and Jean-Michel Raimond.
Since 1998, he has been Professor of Physics at Ecole Normale Superieure de Cachan (ENS Cachan) where he leads the "Quantum Nanophotonics" group. His research focuses on the production and manipulation of light at the single-photon level using diamond color centers, on  single spin detection and manipulation, and on nonlinear optics optics at the nanoscale. He is a member of Institut Universitaire de France and Director of Doctorate Studies at ENS Cachan.

时间：2007年11月5日（星期一）下午3：00      
地点：中科院物理研究所D楼210会议室
联系人：吴令安  研究员（Tel: 82649334）
金奎娟  研究员（Tel: 82648099）
主办单位：中国科学院光物理重点实验室